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On-Call (tm) Shareware Documentation Forest Hill Software, Inc. ALL Your Resident Programs are Just a Keystroke Away For Compaq, IBM PC, XT, AT & compatibles 1 On-Call (tm) Shareware Documentation On-Call is a trademark belonging to Forest Hill Software, Inc. On-Call Shareware Documentation Copyright 1987 Forest Hill Software, Inc. All Rights Reserved On-Call Program, Software, and Related Materials Copyright 1987 Forest Hill Software, Inc. All Rights Reserved WARNING THIS SOFTWARE AND SHAREWARE DOCUMENTATION ARE BOTH PROTECTED BY WORLDWIDE AND U.S. COPYRIGHT LAW (title 17 United States Code), ALL RIGHTS ARE RESERVED. EACH UNAUTHORIZED REPRODUCTION AND/OR SALES MAY RESULT IN CRIMINAL PROCEEDINGS AND IMPRISONMENT OF UP TO ONE YEAR AND FINES OF UP TO $10,000 (17 U.S.C. 506). COPYRIGHT INFRINGERS MAY ALSO BE SUBJECT TO CIVIL LIABILITY No part of this publication may be reproduced, stored in a retrieval system, translated, transcribed, in any form, or by any means, whether manual, mechanical, electromechanical, electric, electronic, chemical, optical, or otherwise, without explicit written permission of Forest Hill Software, Inc. or the copyright owner. Forest Hill Software, Inc. 6689 Orchard Lake Road, Suite 267 West Bloomfield, MI 48322 1-800-443-4134, (313)489-0912 CIS ID: 76556,3335 2 The On-Call Shareware License ----------------------------- BY ACCEPTING AND USING THIS COPY OF ON-CALL, YOU AGREE TO ABIDE BY THIS LICENSE AGREEMENT The On-Call Program in this package is a proprietary product and is protected by Copyright law. Forest Hill Software, Inc. may only license the program and does so only under the following terms: On-Call, its associated files and related materials are distributed "as is" without warranty as to their merchantability, performance, suitability or fitness for any particular purpose, with limited warranty to return for a replacement for defect in magnetic materials or for a latent defect in recording or nonconformity specified in writing for a period of ninety days from date of purchase. To obtain this limited warranty you must first register with Forest Hill Software, Inc. or purchase a copy of On-Call. You may use this copy of On-Call during a short evaluation period, afterwhich you agree to either register with Forest Hill Software or purchase a copy of On-Call prior to continued use. You may make additional copies of this software for distribution to other potential users on a PRIVATE, NONCOMMERCIAL BASIS. You may not distribute this product in connection with any other product or service or charge any fees for its distribution with the exception of registered user groups who may charge a small fee to cover the costs of distribution and provided that it is distributed in unmodified original form. Forest Hill Software has liberal site licensing, corporate use and product bundling agreements available. Contact our sales office for further details. On-Call, its associated files and Shareware Documentation is licensed "AS IS", but On-Call has been designed to perform in substantial compliance with the related materials and documentation supplied with this package. If you find a "bug" or think that a change should be made in the program, write us. If you report a significant defect in performance and documentation in writing with suggested changes and agreement of assignment of rights to us, and if we have not corrected a defect within 90 days, you may return the program, including all copies and related materials to Forest Hill Software, Inc. and we will refund your money. Forest Hill Software, Inc. distributes the program without any copy protection so that you, the user, may easily incorporate On-Call and its associated files into your regular system management procedures. In return for this flexibility you are responsible for compliance with the terms of this agreement. You accept the terms of this agreement and the remedies described above as your only remedies. They will only be available to you if you return the registration form which follows this agreement to Forest Hill Software, Inc. within 30 days of receiving this software. If any provision of this agreement is held unenforceable, the remainder of the agreement shall remain in force. 3 In no event shall Forest Hill Software, Inc. or the copyright owner be liable to you for any damages, including any lost profits, lost savings or other incidental or consequential damages, either direct or indirect, arising out of your use or inability to use the program even if Forest Hill Software, Inc. or its authorized representative has been advised of the possibility of such damages, or for any claim by any other party. Some states do not allow the limitation or exclusion of liability for special, incidental or consequential damages in which case this limitation may not apply to you. In any event all remedies are expressly limited to the amount of money you paid to forest hill software, inc. No dealer, distributor or Forest Hill Software, Inc. employee is authorized to make any changes to this agreement or any other representation as to performance or terms without prior written officer approval. 4 On-Call Product Registration Form --------------------------------- Registering or purchasing a copy of On-Call provides you with some important benefits in addition to supporting the continued development of this and other Shareware products. For a purchase price of 54.95 you receive ----------------------------------------- - The latest version of On-Call on official media - - A detailed typeset copy of the On-Call User's Manual - - Toll-Free technical support for a period of 1 year - - Automatic notification of updates and new products - - Low cost upgrade to the next major release of On-Call - For a registration fee of $24.95 you receive -------------------------------------------- - A license to use this copy of On-Call for noncommercial use - - A detailed typeset copy of the On-Call User's Manual - - One year of free technical support - - Automatic notification of updates and new products - ----------------------------------------------------------------------- To register or order your copy of On-Call, fill out and sent the following form to: Forest Hill Software, Inc. 1-800-443-4134 6689 Orchard Lake Road, Suite 267 - or call - International or MI West Bloomfield, MI 48322 313-489-0912 Or contact us via Compuserve ID: 76556,3335 ___ New Copy of On-Call ($54.95) ___ Shareware Registration ($24.95) Name _____________________________________________ Title __________ Company ______________________________________________________________ Address ______________________________________________________________ ______________________________________________________________ City ___________________________ State/Prov ________ ZIP __________ Country ___________________________ Phone number _____________________ VISA/MASTERCARD # _________________________________ Exp Date __________ Signature _________________________________ Shareware serial number displayed in the On-Call Summary Window _______ Where did you obtain this copy of On-Call _____________________________ Suggestions ___________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ 5 TABLE OF CONTENTS 1. THE SHAREWARE DISTRIBUTION CONCEPT...............................7 2. INTRODUCTION.....................................................9 2.1 System Requirements........................................9 2.2 Quick Start Guide.........................................10 3. INSTALLATION....................................................12 3.1 Distribution Files........................................12 3.2 Floppy Disk Installation..................................12 3.3 Hard Disk Installation....................................12 4. LOADING On-Call.................................................13 4.1 Preliminary Considerations................................13 4.2 Starting The Program......................................14 4.3 Start-up Options..........................................14 4.4 Loading Resident Programs.................................18 4.5 The Summary Window........................................21 4.6 Errors While Loading Programs.............................22 5. USING On-Call...................................................23 5.1 Popping-up On-Call........................................23 5.2 Program Selection.........................................24 5.3 Running Other Software....................................28 6. ACCESSORIES.....................................................30 6.1 OCA.COM...................................................30 6.2 OCP.COM...................................................33 6.3 OCV.COM...................................................33 7. COMPATIBILITY...................................................34 7.1 Case of Mistaken Identity.................................34 7.2 Things to Avoid...........................................34 7.3 Hazards...................................................35 6 1. THE SHAREWARE DISTRIBUTION CONCEPT A major problem with buying software is that you generally need to put your money "up front" before you even get a chance to load and test most software packages. If after testing that software you find that it doesn't solve the problem YOU have or simply doesn't work, you may find yourself stuck with it and unable to get a refund. One way around this problem is the concept known as "Shareware". Shareware distribution allows you to obtain a full working copy of a program, load it into your own personal system and try it for a short time without incurring any financial obligation. If you find the software unsuitable, you simply erase the software or pass it on to another potential user. This doesn't mean that Shareware programs are in the public domain or may be used for free beyond a short evaluation period. Shareware programs, like most other software on the market, are copyrighted works and as such are protected by Federal and international copyright law. Their owners are entitled to be paid for continued use of these programs. But more importantly, you rely on the software you use and the support its authors provide. As a result you have a stake in their continued success. The Shareware concept provides for this through a mutually beneficial arrangement as outlined below. Benefits to you --------------- * Evaluation of software before actually having to pay for it * Easy access to new software and new software updates through a network of thousands of electronic bulletin boards around the country * Lower cost due to the reduced expenses for the developer * The ability to help your fellow computer owners by providing them with a copy for them to try for themselves Benefits to the software developer ---------------------------------- * Simplified distribution and promotion of their product * Direct access to a wide range of users * Reduced marketing costs * More time to improve current products and develop new ones Shareware programs are financed by users "Registering" their copies. But why should you support Shareware and actually pay for something you already have? To begin with, it's the law. More importantly you will receive the additional benefits of having a registered copy. 7 Benefits of supporting Shareware -------------------------------- * You will receive: * A more detailed typeset manual with index and quick reference guides * An absolutely up to date copy of the program on a professionally labeled disk * Technical support via telephone * Automatic notification of updates and new software * You will ensure the continued refinement and support of the software on which you rely * You will encourage software developers to continue to provide high quality software as Shareware * You will help to keep the cost of quality software down by reducing the need of the developer to pay for expensive marketing In short, if you like the ability to test software before you buy it, you hate paying exorbitant prices and you want to share in the success of new and innovative software, then YOU should support Shareware! 8 2. INTRODUCTION Welcome to On-Call and the On-Call Shareware Documentation. By using this product you greatly expand your access to memory resident software and enhanced the capabilities of most other application packages. Within this document you will find all of the necessary information to implement On-Call and inspire solutions to long standing problems with PC/MS-DOS. Please take time to review this document and absorb its contents. However, if you feel the need to jump right in and see how On-Call works, proceed to the Quick Start Guide. For most users, getting this software up and running will be rather easy, but you won't gain the full benefit of On-Call until you have completely reviewed this manual. 2.1 System Requirements To run On-Call, your system must meet the following requirements. All efforts have been made to ensure the greatest degree of compatibility with a wide variety of hardware and software configurations. If there is any question about whether your particular configuration is acceptable, contact the On-Call Sales Department at 1-800-443-4134. Hardware Requirements -------------------- * Any model Compaq computer or close compatible (i.e. IBM PC/XT/AT/PS2) * At least 256 Kilobytes of memory, 640 K suggested * 2 floppy disk drives or 1 floppy disk drive and a hard disk (A hard disk or large RAMdisk is a definite advantage) * A Monochrome, CGA, EGA or equivalent display adapter and Monitor Software Requirements -------------------- * PC-DOS or MS-DOS version 2 or later * At least one properly installed and operational resident program 9 2.2 Quick Start Guide If you simply can't wait to try On-Call, follow these simple steps for a quick test drive. Remember though, to fully utilize the many features of On-Call, you must read the rest of this document. It will explain things that wouldn't otherwise be apparent. But for now... 1. Make a disk which contains all of the On-Call distribution files. 2. Insert a copy of that disk into drive A. 3. Select another drive where there is some space for On-Call to store its image data file and make that the default drive. NOTE: Only the "ONCALL.DAT" file will be placed in that location. You may remove it later. 4. Run the On-Call program. A:ONCALL 5. Wait for the Program Information Window. The "PgmPath:" field will be highlighted. Enter the path to one of your resident programs then press the "Enter" key. Example: C:\DOS 6. The "Program:" field will be highlighted. Enter the file name of the resident program you wish to load, with it's 3 letter extension, then press the "Enter" key. Example: PRINT.COM NOTE: Only .COM and .EXE files may be loaded 7. The "Options:" field will be highlighted. Enter any text, normally required after the file name when starting your resident program, then press the "Enter" key. Example: /Q:24 8. Do not enter anything following "DatPath:", just press "Enter". Later in this manual you will learn how and when to use this field. 9. Your resident program will then load into memory and be stored into the "ONCALL.DAT" disk file. 10. Perform steps 5 through 9 for each additional program you want to load. 11. After loading a few resident programs, press the "Esc" key and wait for the following pop-up window. 10 12. Use the cursor control keys to highlight the desired resident program then press "Enter". The highlighted program will be selected. 13. To select a different program while at the DOS prompt, run the program on the On-Call distribution disk called "OCP.COM". This will cause the Program Selection Window to be displayed. A:OCP 14. From within another application program, press and hold the "Ctrl" key, then press the Right Shift key. On-Call will acknowledge with a short beep then wait for an appropriate time to display the Program Selection Window. 11 3. INSTALLATION Installation of On-Call is straight forward and may be obvious to many users. However, I do suggest that you read through this material to avoid missing information which may be helpful. 3.1 Distribution Files The Shareware version of On-Call is distributed in a single archive file. Included are the following files: READ.ME Current information about On-Call and the On-Call distribution files ONCALL.EXE The On-Call program OCP.COM A utility to facilitate switching resident programs OCA.COM The On-Call Accessory program OCV.COM A utility program to be used only as directed for solving compatibility problems. There may be other files not listed above. Examine the file named READ.ME for information regarding additional files and changes to On-Call. To display the READ.ME file type: TYPE A:READ.ME To print the READ.ME file type: COPY A:READ.ME PRN: 3.2 Floppy Disk Installation There are no installation procedures for you to perform prior to using On-Call on a floppy disk based system. However, it is imperative that you make at least one copy of the distribution files to protect yourself against total loss of this program and its associated files. The only other action you need to take before using the On-Call program is to prepare at least one formatted disk. This disk will be used to store the image data file which On-Call will create. 3.3 Hard Disk Installation To install On-Call on a hard disk, simply copy the distribution files to an appropriate directory. To avoid confusion, a separate subdirectory should be used for these files. 12 4. LOADING On-Call On-Call is so simple to use that you may overlook some of its more subtle features. Please take time to review all of this section. As you will see, a little planning and a general understanding of what On-Call can do for you will make use of this product much more beneficial. 4.1 Preliminary Considerations Before we actually get into using On-Call, lets take a quick look at the way we can handle a couple of special situations. Using Expanded/Extended Memory ------------------------------ On-Call will allow you to place its image data file on any disk drive and in any subdirectory you desire. Because of this, you can instruct On-Call to create and maintain its data on a RAMdisk. Using a conventional memory RAMdisk for this purpose would be counterproductive. However, if it's located in Extended or Expanded Memory, above the 640K DOS limit, the advantage could be a vast improvement in speed over a floppy or hard disk drive. To use On-Call with an expanded memory RAMdisk, follow the instructions included with your expanded memory board or RAMdisk software to create the desired RAMdisk drive. Then refer to the Image Data File section under Start-up Options to learn how to inform On-Call where to locate the image data file. One problem with a RAMdisk is that it will not retain information when the power is turned off. In order to utilize On-Call's ability to reload resident programs from an image data file, copy the file to a floppy or hard disk drive prior to turning off your computer. If you create a batch file to do this and execute it each time before turning off your computer, you will be able to reload all resident programs without loosing their present status and data. If you are a hard disk user, it would also be a good idea to include in this batch file a command to park the heads of your disk drive. Don't forget to include a step in your AUTOEXEC.BAT file to copy the image data file back to the RAMdisk before starting On-Call Permanently Resident Programs ----------------------------- There may be resident programs which you don't want to select with On-Call but would prefer to have available at all times. These programs should be loaded either before or after On-Call. However, On-Call would prefer that you use it to load all resident software so that it can keep things under control. Certain resident programs are rather unruly and conflicts may result from loading them independently of On-Call. If you decide to load another resident program this way, 13 assure that it is working properly and cooperating with On-Call before getting back to work. Any known conflicts will be listed either in Chapter 6 or in the READ.ME file on the distribution diskette. 4.2 Starting The Program Once you have completed the installation procedures, you are ready to start On-Call. To start On-Call type: ONCALL NOTE: If you already have the image data file, called ONCALL.DAT, in the default directory, this command will cause it to be erased and a new file created. If you don't specify any options, either on the command line or via an environment parameter, On-Call will create the image data file in the current directory, on the current drive. It will not attempt to search for an existing image data file as with the automatic reload function described below. It will also default to using "Ctrl" and Right Shift as the Hot-Keys. To change any of these default conditions, or to tell On-Call to skip the file status screens, see the appropriate sections below. As On-Call starts up, it checks the current screen mode and adjusts itself accordingly. If you have your screen set to a color mode, On-Call will display in color. If the mode is black and white or monochrome, On-Call will use non-color attributes. If your screen mode is set either to a graphics mode or any mode not standard for CGA or Monochrome adapters, On-Call will not run. If you have any problems, check the description of the "MODE" command in your DOS documentation. 4.3 Start-up Options On-Call may be given special instructions by placing additional information on the command line or in an environment parameter. These instructions allow you to specify where On-Call should maintain its image data file, what to call the image data file, what Hot-Keys to use, whether to use an existing data file and whether On-Call should bother with message windows. Specifying Options ------------------ You may specify start-up options on the command line as you start On-Call or prior to that with an environment parameter. The method you choose will depend on your particular needs and preferences, both have been provided for convenience. NOTE: The "<" and ">" characters indicate variable information. Do not include them when specifying options. 14 Specify options when On-Call is started: ONCALL /D=C:\OC\ONCALL.DAT Specify options prior to starting On-Call: SET ONCALL=/R/A ...other commands... ONCALL NOTE: You must use "ONCALL" as the environment parameter or On-Call will not recognize it. Refer to your DOS documentation for more information on using the "SET" command and environment parameters. Each option begins with a "/". The letter following the "/" indicates which option. You may place them in any order. If the same option is found both in the "ONCALL" environment parameter and on the command line, On-Call will use the one specified on the command line. Image data file --------------- The image data file is where On-Call will keep any resident programs which are not currently in memory. When a program is selected, it's read out of this data file and placed into memory. When a program is deselected, it's saved back into this data file. This data file must be available when On-Call needs it. If you delete or inadvertently destroy the image file, or if at any time On-Call can't find it, no resident program will be selected. To keep things nicely organized, On-Call allows you to specify where it should find or create this file and what it should be called. If you don't specify, On-Call will call it ONCALL.DAT and place it in the directory and on the drive which is the default when On-Call is first started. If you have a hard disk, you may want to keep this file in the same directory as the On-Call program. Specify Image Data File: /D=<<path name>> To specify the drive and directory for the image data file, include this option on the command line when starting On-Call. Example: ONCALL /D=C:\OC\RP.DAT Note: If you use the "/D=" option you must specify the file name in addition to the drive and path. The examples above ensure that On-Call will maintain its data file called RP.DAT in the OC directory on drive C:. This option is quite useful in conjunction with the auto-reload option. Hot-Keys -------- Once On-Call is loaded, it remains resident in memory but relinquishes control to DOS. The keys you use to inform On-Call that you want the selection menu are called the Hot-Keys. they are by default the "Ctrl" and Right Shift keys. A further explanation of how to pop-up on On-Call 15 may be found in Chapter 4. Since many programs use a wide variety of key stroke combinations to give them commands, On-Call allows you to specify which keys you want for the Hot-Keys. This helps to avoid conflicts. Any combination of the "Alt", "Ctrl", Left Shift and Right Shift keys may be specified. You are required to press all the specified keys, at the same time, to bring up the On-Call selection window. Specify Hot-Keys: /H=A<L> The "/H=" option specifies the desired Hot-Keys. Follow this option with any combination of the letters A, C, L and R, where A represents the "Alt" key, C represents the "Ctrl" key and L and R represent the Left and Right shift keys respectively. Examples: ONCALL /H=AR or SET ONCALL=/H=AR The examples above will tell On-Call to pop-up the program selection window when both the "Alt" and Right Shift keys are pressed. This may be specified differently each time On-Call is started and may be different even though the same image data file is used. Automatic Reload ----------------- An important feature of On-Call is its ability to reuse an image data file. This means that once you have run On-Call and have loaded the desired resident programs, you may never have to reload them again. It also means that your computer will be ready for use in a much shorter time than it would if it had to execute a long AUTOEXEC.BAT file. Using the automatic reload feature of On-Call brings the resident programs back exactly as you left them the last time your computer was on, including data! Specify Automatic Reload: /R The "/R" option instructs On-Call to automatically reload an existing image data file. Examples: ONCALL /R or SET ONCALL=/R To use the automatic reload feature, On-Call must be able to locate the existing image data file. If this file is not called ONCALL.DAT or is not on the default drive and in the default directory, you will have to specify its location and name with the "/D=" option. NOTE: To use the automatic reload feature, On-Call must load in EXACTLY THE SAME MEMORY LOCATION as when the image data file was first created. 16 On-Call will only use the automatic reload feature if it is loaded in exactly the same memory location as when it first created the image data file. The best way to insure that memory locations match is to do everything exactly the same prior to starting On-Call as when you first created the image data file. If On-Call finds that it is not in the same memory location as before, it will not immediately destroy the file, but will ask if you want to continue. At this point you may back out and leave the old image file intact or continue on and let On-Call erase that file and start a new one. If you will be using AUTOEXEC.BAT to run On-Call with automatic reload, you should note that executing a batch file uses a small portion of memory and On-Call will be loaded into a slightly higher memory location. Actually, this is no problem. Simply setup your AUTOEXEC.BAT file and reboot your computer. If On-Call does not find an existing image data file, it will automatically create a new one. If On-Call finds an old image data file which can not be used, it will ask if you want to continue. When it does, answer with a "Y" and load the desired resident programs. The next time you turn on your computer, On-Call will see that the image data file is acceptable and use it. Adding New Resident Programs ---------------------------- A major advantage of On-Call is its ability to "remember" resident programs and make them available, as they were last used, even if your computer has since been turned off. Once a resident program is loaded into On-Call you may never have to "load" it again. It would therefore be inconvenient to have to reload all of your resident programs simply to add a new one to the Image Data File. On-Call has a start-up option which may be used to add a new resident program to an existing Image Data File. For this option to be effective it must be used in conjunction with the Auto-Reload feature. Add a new resident program: /R/A The "/A" option instructs On-Call to request information on a new Resident program by displaying the Program Information Window. When the window is displayed, you may enter information on any number of new resident programs, then press "Esc" to finish loading On-Call. NOTE: Using the "/A" option without specifying "/R" has no effect and may result in overwriting the existing Image Data File. Bypass Message Windows ---------------------- Whenever On-Call reads from or writes to the image data file, it will display a message window explaining what it's doing. This message includes the name of the image data file and which resident program is being loaded or saved. You may inform On-Call that you do not want these messages to be displayed. 17 Bypass Messages: /M The "/M" option instructs On-Call not to display file access message windows. Examples: ONCALL /M or SET ONCALL=/M This option will not have any effect other than to prevent these messages from being displayed. You may decide to use this option when running On-Call on a faster machine, since the message windows will not be displayed long enough for you to read them. 4.4 Loading Resident Programs When On-Call does not perform an automatic reload, or if the "/A" start-up option has been specified, it will present you with a small form to fill out for each program you wish to load. Using this form, you have the option of loading a resident program into On-Call, executing a non-resident program, printing a list of programs which have already been loaded or accessing the context sensitive help screen. If you are using a hard disk drive or a large RAMdisk, you will be able to load as many resident programs as you would like. You may also load the same resident program more than once, if it makes sense to do so. For example, if you have an outliner which can be installed as a resident program, you may want to have access to several outlines at a time. While these programs generally allow multiple files to be loaded at the same time within different windows, doing so will often require a great deal more memory. With On-Call you can load different outlines into different copies of the outliner and easily switch between them. You might find this a bit extravagant if you're using a floppy disk drive to store the image data file, especially if it's a 360K drive. I should mention at this point that you may add, delete, rename or duplicate a program image using the OCA.COM accessory program. This means that you don't have to worry about which programs you want to load or how many times you want them loaded. The On-Call accessories are described in Chapter 5. Entering Program Information ---------------------------- The form you will use to load programs into On-Call consists of four entry fields. Each of these fields are described in detail below, along with some examples. After you place the desired information into each field, press the "Enter" key and the cursor will advance to the next field. Pressing the "Enter" key while in the "DatPath" field will tell On-Call that you have entered all desired information and would like it to load the program. You will notice a program number at the bottom of the program information window. The maximum number of programs that you may load is 40. If you reach this limit, On-Call will automatically take you to the program selection window. 18 PgmPath ------- This field tells On-Call where it can find your program. It should be a complete path including a drive letter and any directories starting from the root directory. If it specifies the "root" directory, it must end with a "\", otherwise it should end with the directory name. Examples: A:\ C:\DOS D:\EDIT\PGM Program ------- Here is where you place the full name of the program which you want to load into On-Call. Unlike executing a program from DOS, this name must include an extension which is either ".EXE" or ".COM". Sorry, ".BAT" files are not allowed. Do not include a drive or path, these should be placed in the "PgmPath" field. Examples: MODE.COM EDITOR.EXE Options ------- With some programs you may be able to specify options or parameters on the command line. This is where you can place these options. On-Call will pass them on to the program, as it is loaded. In this field, place anything which would normally follow the name of the program when starting it from the DOS prompt. Spaces are allowed. Examples: LPT1:/m=32 /W:80 DatPath ------- If prior to loading a resident program, you normally change to a directory other than where the program resides, the path to that directory should be placed here. This may be desired when you want your program to access data files in another directory, without having to specify a path to that directory. As with the "PgmPath" field, you must use a complete path name, including the drive letter and any directories starting at the root directory. If the "DatPath" is the same as the "PgmPath", simply leave this field blank and On-Call will use the path which you have supplied in the "PgmPath" field. Examples: B:\ C:\EDIT\DATA Program Information Window Edit Keys ------------------------------------ Certain keys have assigned functions which facilitate entering program information. These keys are listed below. Pressing an incorrect key or attempting to go beyond the bounds of an input field will cause a low warning beep to be produced, and no action taken. 19 Move up one input field [Up Arrow] Move down one input field [Down Arrow] Move one character to the left [Left Arrow] Move one character to the right [Right Arrow] Move to the first character [Home] Clear input field [Ctrl-Home] Move to the last character [End] Move to "PgmPath" [Pg-Up] Move to the "DatPath" [Pg-Dn] Toggle insert and overwrite modes [Ins] Overwrite mode is indicated by a small cursor. Insert mode is indicated by a large cursor. Delete character at the cursor [Del] Delete character to the left of cursor [<--] Help key [F1] Once the relevant help screen has been displayed you may select the help menu by pressing the "Enter" key or return to the entry form by pressing "Esc". Print list of loaded programs [F9] Done, no more programs to load [Esc] If you do not have any programs loaded, this key will return you to DOS. Problems Loading Resident Programs --------------------------------- If for some reason On-Call is not able to locate or load a program, it will display the program information window with the information you supplied and produce a low error beep. On-Call makes a reasonable guess as to what might have gone wrong and places the cursor in the input field where it thinks the problem exists. If this occurs, you should check all input fields and make any necessary changes. On-Call may also display a message in the "Options" field indicating either that the program did not stay resident or that On-Call is not capable of handling the requested program. These messages are cleared using the "Ctrl-Home" combination described above. 20 NOTE: Some programs must be told to remain resident. These programs may require an entry in the "Options" field. Executing Non-Resident Programs ------------------------------- You may find that while you are loading resident programs into On-Call, you would like to run a non-resident program or execute a DOS command. This is easy to do and does not interfere with the process of loading resident programs. Generally the reason for doing this would be to obtain information on options for the program you want to load. Since On-Call recognizes when a program does not stay resident, it will cause no problems other than having to clear the input fields of any unwanted data before selecting another resident program. To execute a non-resident program from this window, simply supply any required information just as you would for a resident program. After you quit or exit the non-resident program, may use the "Ctrl" and "Home" keys together to clear each input field as you enter information for the next program. If you would like to execute a DOS command, run the program called COMMAND.COM. Running this program is similar to executing the "SHELL" command from BASIC. When you have finished executing any desired programs or DOS commands, simply enter "EXIT", just as you would to return to BASIC. When All Desired Programs Are Loaded ------------------------------------ When All Desired Programs are Loaded When you have loaded all of the resident programs you want into On-Call and have pressed the "Esc" key, a program selection window will be displayed. This is the window you will use to select a resident program and is described later in this manual. For now, just press the "Enter" key, which will select "none" and advance On-Call to the summary window. 4.5 The Summary Window If every thing has gone according to plan, you will soon be presented with the On-Call summary window. This information will remain on the your screen and On-Call will terminate but still be resident in memory waiting for you to call upon it with the designated Hot-Keys. No action is require at this time and you are free to continue with whatever work you desire. Lets take a quick look at the information provided. All values are in Bytes except the version and serial numbers. Version & Serial number This information identifies the source of your Shareware copy of On-Call. Please have this information available when contacting Forest Hill Software to register your copy and include it in any correspondence. Unfortunately, we can only provide support to registered users of On-Call. You may contact our sales department for further information and may even begin receiving telephone support the same day. 21 Total system memory This is the total memory as reported by BIOS. It is possible that this value may vary from the actual amount in your system. Memory free before loading This is the amount of memory which was free before starting On-Call. Total for loaded programs Here is the number of bytes which would have been used by all of the programs, had you not loaded them with On-Call. This value may be larger than your total system memory! Actual memory required This is the memory which has been allocated for use by On-Call. It is the size of the largest resident program plus the size of On-Call itself. Memory savings realized This is the difference between the total for loaded programs and actual memory used. It's one measure of the benefits of On-Call. Following the summary display is a short legal announcement which reminds you that this is copyrighted material and subject to the terms stated herein. 4.6 Errors While Loading Programs Errors are a fact of life, but On-Call will help to soften the blow as much as possible. We have already explained what happens when the specified path or program cannot be found and how On-Call handles non-resident or unusable programs. But what happens when you specify a disk drive that has no disk in it or when you try to print to a printer which is off-line? Fortunately, On-Call will notice this and present you with a small Pop-Up error window. The best action to take if this happens is to try to correct the situation and press the "R" key to Retry. When it is not possible to correct the problem, press the "I" key to Ignore the operation. In either case On-Call will either continue as if nothing has happened or it will return you to where you were before the problem occurred. NOTE: There is a delay before this error window is displayed. This delay may be as short as few seconds for a floppy disk drive which is not ready or as much as 15 seconds for an off-line printer. The delay is within DOS, not On-Call. Don't be too quick to reboot your system when you don't see anything happening. 22 5. USING On-Call In this chapter you will find out how to use On-Call. The following information explains how you can get On-Call to pop-up and how to switch between different resident programs, both from the DOS prompt and from within an application program. 5.1 Popping-up On-Call There are two ways to call upon On-Call. One is for use only at the DOS prompt, the other is for use at all other times. With either method, you will frequently observe a short delay between the time you ask On-Call to pop-up and when it actually does. This is quite normal and is part of a statistical protection scheme which is used to ensure that On-Call does not switch a resident program out at an inappropriate time. If this scheme were not employed, your system would most likely take a vacation each time On-Call switched resident programs. While most resident programs don't seem to be doing anything most of the time, there is quite a flurry of activity taking place, without so much as the touch of a key to start it. Please be patient with On-Call and it will serve you well. As you become familiar with On-Call, you will realize that trying to switch resident programs while they are displaying on the screen is not a very good idea. While On-Call can usually tell if the resident program, which it currently has loaded, is popped-up, We don't suggest that you regularly test that capability. However, if you do make a mistake and press the Hot-Keys while the loaded program is "Up", On-Call will make every attempt to prevent disaster. Popping On-Call From DOS ------------------------ Unlike most other resident programs you may be familiar with, you can not activate On-Call while at the DOS prompt simply by pressing the designated Hot-Keys. Instead, a small program has been provided on the On-Call distribution diskette which can be used to pop-up On-Call. This program is called OCP.COM. It should either be placed in a directory listed in your "PATH" statement (see your DOS documentation) or a "PATH" to it should be included. This way you will be able to activate the On-Call program selection window from within any directory. If using the "OCP" command is awkward, you may rename OCP.COM to any name that may be more convenient for you, as long as it has a ".COM" extension. You may also use the following alternative method to convince On-Call to pop-up from the DOS prompt. Press the designated Hot-Keys, "Ctrl" and Right Shift by default, then execute the DOS "DIR" command. At some point, either during disk access or writing to the screen, On-Call will find an opportune moment and come to life. On-Call may be more or less willing to pop depending on the currently selected resident program. While I have not yet run across such a program, it is 23 possible to write one which could keep On-Call waiting forever. If you have a program which does this, check the "READ.ME" file on your distribution disk. To pop-up On-Call at the DOS prompt type: OCP Popping On-Call From Within Programs ------------------------------------ While running an application program, you can pop-up On-Call simply by pressing the designated Hot-Keys. By default, these Hot-Keys are the "Ctrl" and Right Shift keys. Press both of these keys at the same time then release them to activate On-Call. If you have selected a different combination of keys using the "/H=" option, you must press those keys instead. You will notice that when you press the designated Hot-Keys, a short "Beep" will be produced. This is On-Call acknowledging your request. Before On-Call can proceed you must first release all keys. When On-Call pops, it will produce a lower tone telling you that it is ready to select a program. This may seem superfluous until you try to pop-up On-Call while a graphics screen displayed. Depending on the software you are running, On-Call will either be easy to pop or a bit stubborn. This is a result of the protections we discussed earlier. If On-Call does not pop after a few seconds, continue on with your work. It will most likely pop-up after a few key strokes. In extreme cases, it may be necessary to try some other action, such as disk access. A fairly effective method is to ask the software you are using to display a help screen. This generally will not interfere with your work and is easy to return from when you're done with On-Call. 5.2 Program Selection This section describes how you can switch between resident programs. There are two methods of selecting a resident program. One is used when the display is set to a standard text mode. The other is used when the display is set to a graphics or non-standard text mode. However, there is a common thread between these methods regarding use of the "Esc", "Enter" and "Crtl-Enter" key sequences. These allow you to keep the selected resident program, save the selected resident program, save the selected resident program and switch to a different one or forget the selected resident program and switch to a different one. Exactly how to perform these functions is described in detail below. Text Mode Selection ------------------- When On-Call is popped-up, if your screen is in a text mode which is standard for either a Monochrome or CGA adapter, you will see On-Call's Resident Program Selection window. At any one time, this window will display the names of 12 resident programs loaded into On-Call. The 24 currently selected program or "(none)" will either be highlighted or displayed in reverse video. Since On-Call allows you to load the same program more than once, it must be able to identify each copy. It identifies duplicates by including a parenthesized number after the program name and will treat them as totally separate entities. You can rename these duplicates using the OCA.COM accessory program. Doing so will make it easier to identify each copy. The OCA.COM program is described in Chapter 5. Selecting the desired resident program is basically a Point-and-Shoot procedure. The selection screen can only display 12 program names at one time, while On-Call can manage up to 40. If the program you want to select is not shown on the display, simply move in the direction of that program and the list will "Scroll", exposing the unseen programs. The following is a list of the keys you may use while the selection window is displayed. Pressing an illegal key or attempting to go beyond the limits of the listed programs will cause On-Call to produce a low warning beep and ignore that keystroke. Program Selection Keys ---------------------- Move up one program [Up Arrow] Move down one program [Down Arrow] Move one to the left, with column wrap [Left Arrow] Move one to the right, with column wrap [Right Arrow] Move to the first program listed [Home] Move to the last program listed [End] Move up 12 programs [Pg Up] Move down 12 programs [Pg Dn] Save current program, select highlighted [Enter] Switching programs in this way will ensure that when you return to a resident program it will be exactly as you left it. On-Call will recognize if you are re-selecting the currently selected program and not unnecessarily read it back in from the image data file. Doing this occasionally is roughly equivalent saving your work within the constructs of your resident program, and may be faster. Forget current program, select highlighted [Ctrl-Enter] This sequence is used when you want to change programs but don't want the currently selected resident program to be saved 25 to the image data file. You may also use this function to avoid saving changes you have made. In fact, if you have the currently selected program highlighted when you press these keys together, you will have returned that program to the state it was in the last time you selected it. Display context sensitive help information [F1] Pressing this key will display a screen of information related to selecting a resident program. To access the Help menu, press "Enter" then the letter shown for the desired help screen. The "Esc" key will return you to program selection. Print a list of loaded programs [F9] Exit without making any changes [Esc] Use the graphics mode "Blind" selection method [G] You may have to use this command when running On-Call with certain graphics programs. If the display is in graphics mode when you Pop-Up On-Call and you see random nonsense at the top of the screen, press the "G" key. On-Call will restore the screen and begin using the graphics mode selection method described below. When you select the desired resident program, On-Call will perform any required disk access to save the current program and/or select the new one. Unless you specified the "/M" option or are working in a graphics mode, a status window will indicate what On-Call is doing as it proceeds. If you keep the image data file on a RAMdisk or a fast hard disk, you may not have time to read these messages. On the other hand, if you are using a 720K Microfloppy drive, it should give you something to do while you wait. When On-Call is done, it will produce a characteristic three tone sequence indicating that it is safe to proceed with your work. Please wait for this indication before proceeding. Non-Text Mode Selection ----------------------- Unlike some other resident programs, On-Call does not attempt to interact with the display when it is in a graphics or non-standard text mode. This doesn't mean that it won't work. However, it does mean that resident program selection takes place "Blind". The process is directed by different "Beeps" which are easy to recognize and guide you through the process. You should carefully follow the procedure below the first time through, after that it will quickly seem natural. 1. Pop-Up On-Call with the designated Hot-Keys Just as it does in text mode, On-Call produces two beeps before displaying the program selection window. These beeps, which may 26 have seemed unnecessary in text mode, will let you know when On-Call is ready for you to enter the desired program name. Some graphics programs do not conform to all DOS conventions. With certain graphics programs, On-Call may not be aware that the display is set to a graphics mode and attempt to display the program selection window. If this happens, the screen will partially fill with random nonsense. When you see this happen, or if after popping On-Call, it does not seem respond to you key strokes, press the "G" key. On-Call will then restore the screen and begin using the "Blind" selection method. 2. Enter Desired Program Name When typing the program name, include the extension (.EXE or .COM) or On-Call will not be able to find your program. Do not include any parenthesized numbers. If you get lost trying to type the program name, use the Rubout key (above the Enter key) to back up to the point at which On-Call produces the low tone error beep. That will indicate that you have deleted all of the characters typed so far. Program names can be up to 12 characters long. If you type too many characters On-Call will produce the low tone error beep and ignore your key strokes. The process of matching the name you type to the list of loaded programs is "Case Sensitive". This means that a capital letter is not considered to be the same as a small letter. This will be important to remember once you have changed a program name with the OCA.COM accessory program. If you only want to save the program which is currently selected, do not enter the program name. 3. Press either "Enter" or "Ctrl-Enter" The effect is the same as for text mode selection. If you press "Enter", the currently selected program will be saved. Pressing "Ctrl" and "Enter" together will not save the current program before selecting the new one. If On-Call locates the desired program, it will confirm that with a high tone beep and proceed to switch to that program. Since you will be in a graphics or non-standard text mode, no status windows will be displayed. Please wait for the characteristic three tone sequence indicating that On-Call is done. If On-Call can't find a program with the name you supply, it will produce a low error beep. At this point you may retype the program name or print a list of currently loaded programs by pressing "F9". 27 Pressing the "Ctrl" and "Enter" combination without first typing a program name will select "none". You may optionally type the word "none" and press "Enter". 4. If More than 1 high beep, enter copy number On-Call produces one high beep for each program matching the entered name. If it only finds one matching program, that program will be selected. If you hear more than one high beep, On-Call will be waiting for more information. Type the number of the copy you wish to select then press "Enter". You must wait for the three tone sequence indicating that On-Call is done. If you type an invalid number, On-Call will produce a low tone error beep and you will have to reenter the program name. At any time you may press "Esc" to quit resident program selection. Doing so will preserve the currently selected program unless you have already used the "Ctrl-Enter" combination to enter a program name. Printing a List of Loaded Programs --------------------------------- While loading or selecting programs, you may press the "F9" key to print a list of resident programs which are currently loaded. This list will include the name and size of each program, the total for all programs, the path and name of the image data file and the designated Hot-Keys. You may want to print this list once and keep it handy, especially if you frequently work in graphics or non-standard text modes. If your printer is off-line when you try to print this list, the error window will pop-up. It will then wait for you to press either "R" for Retry or "I" for ignore. Unfortunately, Ignore only bypasses one character at a time, which would be rather inconvenient in this case. I therefore suggest that you set the printer on-line and press "R" for Retry. 5.3 Running Other Software There is nothing special that you have to do while On-Call is loaded, other than the procedures above for switching resident programs within On-Call. Operation of your nonresident software will only be changed by the added functionality you will receive from having On-Call managing your resident programs. When On-Call is not popped-up, you are free to conduct business as usual. However, there is one thing you may occasionally notice. Some resident software is rather difficult to manage. In an effort to keep things under control, On-Call may, at it's discretion, store away your currently selected resident program and go to a "none" selected status. This will only happen with certain resident programs and only when you 28 are starting a program. Please note that On-Call does not ask for permission to save your resident program. If you don't want it saved in it's present state, you will have to deselect it manually before starting the new program. 29 6. ACCESSORIES The On-Call distribution files include several programs in addition to On-Call itself. One of these programs enhances the capability of On-Call by allowing you to add, delete, duplicate and rename resident program images. With the same program you may set certain default values for On-Call, such as Hot-Keys, protection level, display of disk access messages and how On-Call will handle each system interrupt. Other programs allow easy access to On-Call from DOS and solve compatibility problems. This chapter will describe each of the On-Call accessory programs and how to use them. Please note that some features of these accessory programs are only to be used as described in the supplied documentation, READ.ME file, or under the direction of the On-Call Customer Service Department. 6.1 OCA.COM The OCA.COM program is the largest of the On-Call accessories. This program will allow you to manipulate resident program images and set default values for ONCALL.EXE. Before you start this program, use the DOS "CD" command to change to the directory containing the ONCALL.EXE program. The OCA program expects to find ONCALL.EXE in the default directory. If the program isn't found, you won't be able to use any of the options under the "Configure On-Call" main menu selection. To Start OCA type: CD \OC (or directory containing On-Call) OCA You will be informed if there is any problem locating or reading ONCALL.EXE. WARNING: Please read all message windows carefully as they may provide important information. When the program has been loaded and ONCALL.EXE has been examined, OCA will provide you with the main menu. This menu has three options, "Edit Program Image File", "Configure On-Call" and "Quit Accessories". You make your selection either by using the arrow keys to highlight the desired option and then pressing the Enter key, or by typing first letter of the desired option. All subsequent menus operate in the same way, except that they are vertical as opposed to horizontal. Edit Program Image File ----------------------- From the "Edit Program Image File" menu, you may list the contents of a file, erase an image, duplicate an image, add an image from another file or rename a program image. To return to the main menu press Esc. When selecting an option from this menu, you will be asked for a file name. Be sure to enter the full path and file name or OCA will not be able to locate the data file. Then press Enter. The above window is also used for several other options. Since the ":\" is always required, it is automatically provided for your convenience. OCA will 30 display an error message if it can't find the desired file or has a problem reading it. Options on the Edit Program Image File Menu are: List Image File This option lists the images in the specified image file. With each image name is the number of bytes required for that program. Statistics for the entire file are listed at the top. Erase an Image This option allows you to remove an image from an image data file. This may be required if a problem has developed with that program and the image is no longer useful. You may also use this option to remove a program which is no longer needed. Follow the instructions provided on the screen to select and erase an image. Duplicate an Image This option will create two identical images from one which already exists. After creating the new image, OCA will scan through the list of images and renumber any duplicates as necessary. You should then use the "Rename an Image" option to specifically identify each copy. Copy an Image This option will copy an image from one file to another. This allows you to add a new image to an existing file. The images from both files must have been loaded in exactly the same way or OCA will refuse to copy the image. You may check the "Base Address" of both files with the "List Image File" option to see if they match. NOTE: See the "/A" start-up option for information on how to add a new resident program to an image data file. Rename an Image This option will allow you to assign a logical name to an image. The new name may contain any desired characters or punctuation but may not be more than 12 characters long. You can then refer to an image by its logical name rather than its original program name. Using short, or even 1 letter names, will simplify selecting a resident program in the graphics selection mode. If you erase or duplicate an image, the entire image data file will be copied and the original file will be renamed with the extension ".BAK". If there is a problem during one of these operations, the resulting file may be unusable or nonexistent. If this happens, or you simply 31 change your mind, delete the new file and rename the ".BAK" file to its original name. Erasing or duplicating an image will require enough disk space to copy the entire image data file. Floppy disk users may find this an insurmountable limitation, for which we apologize. OCA will fail the operation if the space is not available and leave the ".BAK" file intact. Configure On-Call ----------------- From the "Configure On-Call" menu you may set default parameters and adjust how On-Call operates. Certain options in this menu should be used with caution or only with specific directions. These options will only be available if OCA was able to find the ONCALL.EXE program in the default directory. OCA will also refuse access to any of these options if it finds unexpected or inconsistent data. WARNING: Please read the information below before experimenting. Options on the Configure On-Call Menu are: Hot-Keys This option will allow you to set the default Hot-Keys for On-Call. Once set, this default may be overridden with the "/H" option when starting On-Call or in the ONCALL environment parameter. Follow the instructions provided by OCA to set the desired keys. Bypass Messages On-Call displays a message window each time the disk drive is accessed. On a faster system, you may not have time to read these messages and therefore may not want to bother with them. This option allows you to deactivate these messages. Once set, this default may be overridden with the "/M" option when starting On-Call or in the ONCALL environment parameter. Protection Level On-Call resists popping-up when the selected resident program is in some way active. This option sets a relative level of protection. The higher the number, the more resistant it is to popping. As distributed, this level is set to 2 which is moderate protection. The maximum value of 100 will make it almost impossible to access On-Call once a program is selected. If you find that your computer occasionally "hangs", either when popping or exiting On-Call, you should set this level a little higher. Try increments of 5 or 10. 32 Interrupts This option should only be used when specifically directed by the On-Call documentation, READ.ME file, or Customer Service Department. WARNING: Making indiscriminate changes to the interrupt handling of On-Call will most assuredly result in disaster. 6.2 OCP.COM The OCP.COM program provides access to the On-Call program selection window from the DOS prompt. Its use has already been discussed in Chapter 4. You should make this program available by including a path to it in the "PATH" statement of your AUTOEXEC.BAT file. You may find that OCP has trouble popping-up the program selection window when you have certain resident programs selected. If this occurs, check the protection level described above. 6.3 OCV.COM The OCV.COM program solves a particular type compatibility problem with certain types of software. Quite simply, OCV allows these programs to "See" other related programs. Refer to the READ.ME file on the On-Call distribution diskette for information about specific software which requires use of this accessory program. WARNING: Use OCV.COM only as specified in the READ.ME file or as directed by the On-Call Customer Service Department. 33 7. COMPATIBILITY Unlike most software programs, On-Call does not function totally on its own. Its job is to juggle other software in a way their authors may not have considered. While every attempt has been made, and will continue to be made, to accommodate the wide variety of resident software, compatibility problems may arise. Please take the time to ensure that your resident and non-resident software is cooperating with On-Call. 7.1 Case of Mistaken Identity Some software programs get their high performance by directly controlling the hardware in your system. Well behaved programs will inform BIOS and DOS of any changes which may affect other software. Some not so well behaved programs do not. It can be difficult, at times impossible, for other software to determine exactly what has been done by these programs and what state the hardware may be in. As a result, other software may tend to behave in a way inconsistent with the actual hardware state. On-Call has been written to comply with accepted rules and it's overall compatibility with other software is a testimonial to that. It can however be fooled by another program's slight of hand. One case in particular is graphics software which does not inform BIOS of the current state of the display. When running these programs, On-Call may mistakenly assume the wrong display mode and attempt to display the text mode selection screen on a graphics mode display. The result will be random nonsense at the top of the screen or no effect at all. If this happens simply press "G" to inform On-Call that you would like to use the graphics mode "Blind" selection method. When you do this, On-Call will restore the screen to normal and use "Blind" selection. 7.2 Things to Avoid Certain types of resident software won't make sense to load with On-Call. Others may have problems simply because they will be switched in and out of memory. Certainly, utilities such as disk caching programs will be dangerous to disable indiscriminately. These programs have become quite popular to speed disk access on floppy disks and the slower hard disk drives which have flooded the market. Deselecting this type of program, especially from within application software, could result in loss of data or corruption of the storage media. I suggest you load these programs prior to starting On-Call. This way they will always be in charge of disk access and may even speed switching resident programs with On-Call. Please feel free to try loading these programs into On-Call, but it may be a good idea to do so with a disk that is properly backed up. Other problem programs may be difficult to identify. Some software will become confused if there are changes to the system hardware or software status while they're switched out. These may be programs which work with serial or parallel I/O ports such as communications programs 34 or network drivers. Others might not be able to handle an unexpected change in display status. A typical example would be a spelling checker which was not in memory when the word processor was changed from overwrite to insert mode. This is not to say that these programs can't be managed with On-Call, in fact the trade-off in memory savings may be worth the added attention they will require. Another consideration is related to performance. It might be best to run programs which require extremely fast response and processing of interrupts without On-Call loaded. While the overall impact on performance is generally minimal, the time required to respond to hardware interrupts could occasionally be affected. Any high speed data acquisition or communications programs should be fully tested with On-Call before they can be considered reliable. 7.3 Hazards Several ways of getting into trouble with On-Call have been covered in this manual. If you follow these rules, the chances of having problems will be greatly reduced. Don't rush On-Call Typing ahead of the software may save some time, but doing so when loading programs into On-Call could spur unnecessary activity and conceivably cause trouble. Also, don't rush to help pop-up On-Call. The less that is going on, the sooner it will be able to find an opportune moment. If after a few seconds it still doesn't pop-up, proceed with other measures. Don't switch programs while the selected program is on the screen The chances of On-Call popping-up at such a time is slim, but if you are successful, the penalty could be having to reboot. If you do find the On-Call selection menu pops over the selected program, you should press the "Esc" key to exit back to that program. Be careful about changing disks Don't change diskettes in the middle of a program simply to satisfy On-Call. If the program you are running doesn't perform disk access, you may be safe. Otherwise, it is possible to corrupt either or both diskettes. Try to plan your disk usage so that this kind of a swap will not be necessary. If On-Call doesn't find the image data file when trying to switch programs, it will go to a "none" selected status and return to the program which was interrupted. Use OCV.COM only as directed The OCV.COM program circumvents some of the interrupt monitoring which is critical to safe use of On-Call. You should 35 restrict use of this program to that specified in the On-Call documentation, READ.ME file or by the On-Call Customer Service Department. Use OCA Interrupts option only as directed The Interrupts option of the OCA.COM program is intended to be used only as specified in the On-Call documentation, READ.ME file or by the On-Call Customer Service Department. If you make unauthorized changes to the interrupt settings, do not expect On-Call to function properly. ( End of Shareware Documentation ) 36