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- THE INVISIBLE LINK
-
- Copyright (C) 1987
- Robert Best and Garland Wong
- Santa Ana, CA and La Jolla, CA
- All Rights Reserved
-
- I. ABOUT INVISIBLE LINK
-
- The Invisible Link is a general purpose asynchronous communications
- program. However, it differs from an ordinary communications program in
- that the Invisible Link is memory-resident and designed to function as a
- background task executing concurrently with any MS-DOS application
- program. This means you can dial or transfer files in the background
- without tying up your computer system. Imagine, you can simultaneously be
- working in your favorite word processor or spreadsheet and still be
- dialing a busy number or receiving those important files. Best of all,
- you won't even notice that IL is running or "doing its thing". In terms
- of time savings alone, IL will "pay for itself" during its first hour of
- use. IL was written in assembly language for optimum size and speed. It
- represents the result of a thorough six month period of development and
- testing. It has proven to run faster and more reliably than the
- competition (who charge from $100 - $200 for their product), as any
- thorough benchmarking will testify. When you are transferring a file in
- the background, there is no noticeable degradation in your foreground
- application program. Lastly, you can use IL's background transfer or dial
- capability along with your favorite communications program. This means
- you don't have to give up your favorite communications program because IL
- was designed to work within or along side them.
-
- The Invisible Link has the following features:
-
- - Communicate at speeds up to 9600 baud (limited by the speed
- of your serial port and modem.)
-
- - Exchange binary or text files in the background using
- Xmodem CRC or Xmodem Checksum Protocol.
-
- - Queue up to 10 files to upload or download for unattended
- operation.
-
- - Automatically send a "goodbye" command to hang up the phone
- when the file transfer has completed
-
- - Queue up to 5 numbers and dial in the background. IL will
- prompt you when a connection is made.
-
- - You can manually dial or choose from a 44 number dialing
- directory.
-
- - All commands in IL are invoked using simple one or two key
- sequences.
-
- - Dynamically alter communication parameters. You can change
- communication speeds and choose between no parity and 8 data bits
- or even parity and 7 data bits.
-
- - Dynamically alter auto redial rate. You can vary the time between
- redialing anywhere from 10 seconds to one minute.
-
- In short, the Invisible Link is a powerful yet unobtrusive communications
- program. It is both a timesaving utility and a productivity tool.
-
- II. GETTING STARTED
-
- 2.1 What You Need (Basic Requirements)
-
- The Invisible Link requires the following as a minimum:
-
- - IBM PC, XT, AT, or 100% Compatible.
-
- - DOS 2.0 or Later.
-
- - IL requires about 26K of RAM when loaded.
-
- - One Disk Drive or Hard Drive.
-
- - Serial I/O Port with a Modem.
-
- - CGA, EGA, IBM Monochrome, or Hercules Video Adapter.
-
- - Any Monitor Capable of Displaying 80 Characters Per Line.
-
- 2.2 Loading Invisible Link
-
- Loading The Invisible Link is a simple one step process. You pass IL
- various configuration information via command line arguments. First, all
- you need is the file IL.COM. There are no overlays to worry about.
- Second, IL needs to know which communications port you will be using.
- Third, IL also needs to know where IL.COM is stored. This is because when
- you change your directory, IL needs to know where to update the directory.
- By default, IL will assume that you will be using communications port 1
- and that IL is stored on the current drive in the current subdirectory.
-
- The format of the command line is as follows:
-
- IL [COMM PORT] [FULL PATHNAME OF WHERE IL IS STORED]
-
- Note that you can specify the pathname first and then the COMM port or
- vice versa. The order does not matter.
-
- EXAMPLES OF LOADING THE INVISIBLE LINK
-
- A>IL<RETURN> <RETURN> means hit a carriage return. If you load IL this
- way, COM1 will be used and IL will look for IL.COM on the current drive in
- the current subdirectory.
-
- A>IL 2<RETURN> IL will use COM2 and update its directory on the current
- drive in the current subdirectory.
-
- A>IL 1 A:\IL.COM<RETURN> IL will use COM1 and update its directory on
- drive A: in the root directory.
-
- Note that when you are specifying a path that it must be a full path
- including the three letter extension. For example, C:\IL\IL is not
- valid but C:\IL\IL.COM is valid.
-
- A>IL C:\IL\IL.COM 2<RETURN> IL will use COM2 and update its directory on
- drive C: in the subdirectory IL.
-
- If IL is already loaded, you will get the "INVISIBLE LINK USING ALT-RIGHT
- ALREADY LOADED -- ABORTING!" message. You will then return to DOS.
-
- NOTE: It is strongly recommended that IL be loaded last in the chain of
- memory resident programs. In particular, it must be loaded after CED in order
- to properly enable the switches installed to prevent system crashes.
-
- III. YOUR BASIC COMMANDS
-
- 3.1 Invoking Invisible Link
-
- ALT - RIGHT-SHIFT => Invoke The Invisible Link. To invoke The Invisible
- Link, simply hold down the <ALT> and <RIGHT-SHIFT> key simultaneously.
- The Invisible Link was designed to be very robust so there are times when
- IL will not let you "pop in" because it is not safe. Usually, it is not
- safe when DOS is doing critical disk activity such as during a COPY or
- TYPE command. Just wait until your disk drive light goes off and then hit
- <ALT> and <RIGHT-SHIFT> key. When you "pop into" IL, you will be
- presented with the following message, "TERMINAL MODE, HIT ALT - F10 FOR
- HELP!". You are now ready to begin your communication session.
-
- 3.2 Terminal Commands
-
- 3.2.1 Setting Communication Parameters
-
- ALT - P => Set Up Communication Parameters. Use this command when you
- want to set the baud rate or choose the data, parity, and stop bits. The
- Invisible Link supports the two most popular communication configurations:
- even parity, 7 data bits, and 1 stop bit; and no parity, 8 data bits and 1
- stop bit. When you hit ALT - P, will be presented with the following
- prompt at the bottom of the screen.
-
- Baud Rate For 8, 1, No Parity: 0) 300 1) 1200 2) 2400 3) 4800 4) 9600
- Baud Rate For 7, 1, Even Parity 5) 300 6) 1200 7) 2400 8) 4800 9) 9600 |
-
- At this point, type the number corresponding to the configuration you
- wish. For example, hit 6 if you want 7 data bits, 1 stop bit, even
- parity, and 1200 baud. An invalid entry will leave the configuration
- unchanged. The user selected configuration will remain in effect until
- you change it or if you reboot the computer.
-
- 3.2.2 Clearing The Screen
-
- ALT - C => Clear The Screen. At any time you can clear the screen by
- holding down <ALT> and C key simultaneously.
-
- 3.2.3 Hanging Up The Phone
-
- ALT - H => Hang Up The Phone. You may hang up the phone my hitting the
- <ALT> and H key simultaneously. After the phone is hung up, IL will
- return you to terminal mode and prompt you with OK.
-
- 3.2.4 Auto-Redial Rate
-
- ALT - R => Alter the Auto-Redial Rate. You will be prompted to enter a
- number between 0 and 9 which causes the redialing rate to be adjusted
- between 10 seconds and one minute, in 5 second intervals.
-
- 3.3 Making A Connection
-
- 3.3.1 Using The Dialing Directory
-
- ALT - D => Access The Invisible Link Dialing Directory. Invisible Link's
- dialing directory can be brought up by holding down the ALT and D key
- simultaneously.
-
- If the directory does not come up after hitting ALT-D, chances are your
- modem may not be turned on. Try turning the modem on and restriking
- ALT-D. The Invisible Link was designed to dial only if a modem is
- connected.
-
- 3.3.1 Using The Dialing Directory
-
- ALT - D => Access The Invisible Link Dialing Directory. Invisible
- Link's dialing directory can be brought up by holding down the ALT
- and D key simultaneously.
-
- If the directory does not come up after hitting ALT-D, chances are
- your modem may not be turned on. Try turning the modem on and
- restriking ALT-D. The Invisible Link was designed to dial only if
- a modem is connected.
-
- 3.3.1.1 Dialing A Number Or Queueing Numbers
-
- After hitting ALT-D, IL will prompt you for the following: an
- entry to dial, whether you wish to revise an entry, or whether
- you wish to delete an entry. Type a number between 1 - 44 and IL
- will acknowledge your valid entry by putting '>' by that entry.
- You may queue up to 5 numbers. If you have less than 5 numbers
- to dial, hit a empty <RETURN> and you will return to terminal
- mode. At which point, IL will dial your numbers once every X
- seconds (where X is the Auto Redial Rate) until a connection is made.
- Furthermore, you may return to your application. When a connection
- is made, IL will beep and inform you that a connection has been made.
- Note, that hitting ALT-D again (or ALT-M) will stop any subsequent
- dialing.
-
- 3.3.1.2 Adding New Entries Or Revising Existing Entries
-
- By typing "R" at the above prompt, you may add new entries or
- edit existing entries. A window will pop up and IL will prompt
- you for an entry number. If the number you type has no existing
- entry, then IL will bring up a blank entry. You may type in the
- name and telephone number in the respective fields. For the baud
- rate the following conventions are used:
-
- Type 0 for 300 Baud Note that IL uses the data bits, stop
- Type 1 for 1200 Baud bits, and parity from the last ALT-P
- Type 2 for 2400 Baud command, but will use the baud rate
- Type 4 for 4800 Baud specified in the directory for the
- Type 9 for 9600 Baud given entry.
-
- If the entry was an existing one, IL will display the old name,
- telephone number, and baud rate. You may now input these
- parameters. Note, if you hit a blank <RETURN> on the baud rate
- field, IL assumes 1200 baud by default. After you have input all
- the information for the directory, hit a blank <RETURN> and IL
- will update the directory.
-
- 3.3.1.3 Deleting Entries
-
- By typing "D", IL will prompt you for the number of the entry you
- wish to delete. IL will then ask you "Are You Sure?". Typing
- 'Y' will delete the entry and 'N' will not delete the entry. To
- return to the dialing menu, hit a blank <RETURN>
-
- 3.3.2 Manually Dialing A Number
-
- ALT - M => Manually Dial A Number. You can manually queue up to 5 numbers
- to dial. Hit Alt-M, and you will be prompted to input the telephone
- numbers. Hit a blank <RETURN> when you are done. At this point, IL will
- dial your numbers continuously in sequence until a connection is made. By
- default, IL will wait 30 seconds between each redial, however, this rate
- can be adjusted using ALT-R. If you want, you can now return to your
- interrupted program and dial in the background. IL will beep when a
- connection is made. Note, hitting ALT-M again while you are in terminal
- mode will cancel the current dialing session independent of whether it was
- started via ALT-D or ALT-M.
-
- 3.3.3 Terminating A Background Dial
-
- ALT - LEFT-SHIFT => Terminate Background Dial. If you are not in terminal
- mode (i.e. you are in your foreground application program), you can
- terminate a background dial by holding down the ALT and LEFT-SHIFT
- simultaneously. IL will acknowledge by beeping and displaying the
- "BACKGROUND DIALING TERMINATED!" message.
-
- 3.4 Transmitting A File
-
- 3.4.1 Uploading A File
-
- PAGE UP KEY => Start An Upload. To start an upload, hit the PAGE UP key
- (it is located on the numeric keypad and is the number 9 on a standard IBM
- PC). IL will prompt you for the name of the file you wish to upload. You
- may specify full pathnames if your files reside in other directories other
- than the current one (i.e. C:\IL\FOO.EXE is a valid path name). Next, IL
- will prompt you for the command that will be sent to the host. For
- example, U X FOO.EXE is a command that tells the host that you will be
- uploading file FOO.EXE with XMODEM protocol. For an upload, IL will
- automatically determine if CRC or Checksum protocol will be used. You
- will then be prompted for a description of the file to be uploaded. This
- will be transmitted to satisfy the request given by most current Bulletin
- Board Systems. If desired, this request can be ignored by entering a
- carriage return at the prompt. After entering the description, you will
- again be prompted for another file to upload. With IL, you can queue up
- to ten files to upload. That means you can enter ten files and ten upload
- commands. If you will be uploading less than ten files, hit a blank
- <RETURN> on the file prompt. IL will then ask you for a goodbye command.
- This is a convenient way to hang up the phone after a transfer is
- completed. Enter a "G" for goodbye. IL automatically sends a "Y' to
- confirm that you want to hangup. At this point, the transfer will begin
- in the background.
-
- Note that once a transfer is going, you are returned to the foreground
- program and locked out of the terminal. This means you can not hit ALT -
- RIGHT-SHIFT to enter IL's terminal. Only after you see the "INVISIBLE
- LINK TRANSFERS COMPLETED!" message and the bell rings is it safe to pop
- into IL.
-
- 3.4.2 Downloading A File
-
- PAGE DOWN KEY => Start An Download. To start a download, hit the PAGE
- DOWN key (it is located on the numeric keypad and is the number 3 on a
- standard IBM PC). First, IL will prompt you for the protocol that you
- wish, CRC or Checksum. Select 1 for XMODEM-CHECKSUM or 2 for XMODEM-CRC.
- CRC is less prone to errors in transmission but tends to slow the computer
- down a little more than Checksum*. Next, IL will prompt you for the name
- of the file you wish to download. You may specify full pathnames if your
- files reside in other directories other than the current one (i.e.
- C:\IL\FOO.EXE is a valid path name). Next, IL will prompt you for the
- command that will be sent to the host. For example, D X FOO.EXE is a
- command that tells the host that you want to download file FOO.EXE with
- XMODEM protocol. After entering the download command, you will again be
- prompted for another file to download.
-
- If a file already exists, IL will prompt you if you wish to overwrite.
- You may enter 'Y' if you wish to overwrite or 'N' if you do not. If after
- 5 seconds, you do not respond, IL will assume that you do want to
- overwrite the file and the transfer will start. This feature was
- incorporated into IL for the sole purpose of permitting unattended
- transfers.
-
- With IL, you can queue up to ten files to download. That means you can
- enter ten files to download and ten download commands. If you will be
- downloading less than ten files, hit a blank <RETURN> on the file prompt.
- IL will then ask you for a goodbye command. This is a convenient way to
- hang up the phone after a transfer is completed. Enter a "G" for goodbye.
- IL automatically sends a "Y' to confirm that you want to hangup. At this
- point, the transfer will begin in the background.
-
- Note that once a transfer is going, you are returned to the foreground
- program and locked out of the terminal. This means you can not hit ALT -
- RIGHT-SHIFT to enter IL's terminal. Only after you see the "INVISIBLE
- LINK TRANSFERS COMPLETED!" message and the bell rings is it safe to pop
- into IL.
-
- 3.4.3 Invoking The Status Screen
-
- ALT - LEFT-SHIFT => View File Transfer Status. At any time during a file
- transfer, you can view the status of the current file being transferred by
- hitting ALT - LEFT-SHIFT. You have access to the following information:
- upload or download, full pathname of file, mode of transmission (CRC or
- Checksum), Current Block Number, consecutive error count, and total error
- count. If you are doing an upload, you will also see the total number of
- blocks for that file. Once in the status screen, hitting 'Q' will abort
- the transfer of the current file and proceed with the next file in the
- queue. Hitting any other key will return you to the foreground program.
- You can pop into the status screen as many times as you wish.
-
- IL will abort the transfer itself after 10 consecutive errors and proceed
- with the next file in the queue if there is one. Please note that your
- total error count will be higher than when you are using a conventional
- communications program. This is because IL is transferring in the
- background. So, if you see a high total error count, don't be alarmed.
- IL was designed with a robust error recovery system, so chances are the
- file was sent properly.
-
- 3.5 Exiting Invisible Link
-
- ALT - X => Exit The Invisible Link But Leave Online. You can exit IL by
- hitting ALT-X. This will leave you online and return you to the suspended
- foreground application program. You can enter and leave the terminal as
- many times as you wish.
-
- ALT - Q => Exit The Invisible Link And Hang Up The Phone. You can exit IL
- and hang up the phone by hitting the ALT and Q key simultaneously. IL
- will prompt you with "Are You Sure You Want To Disconnect?". Typing 'Y'
- will hang up the phone and return you to your suspended foreground
- application. Hitting any other key will return you to the terminal.
-
- IV. SUMMARY OF COMMANDS
-
- KEYSTROKE COMMAND
-
- ALT - RIGHT-SHIFT ENTER INVISIBLE LINK.
-
- ALT - X EXIT INVISIBLE LINK BUT LEAVE ONLINE.
-
- ALT - Q EXIT AND HANG UP PHONE (DROP DTR).
-
- ALT - P CHANGE COMMUNICATION PARAMETERS.
-
- ALT - H HANG UP PHONE AND RETURN TO TERMINAL.
-
- PG UP START AN UPLOAD.
-
- PG DN START A DOWNLOAD.
-
- ALT - D DIAL A NUMBER USING A DIRECTORY.
-
- ALT - M MANUALLY DIAL A NUMBER.
-
- ALT - R ALTER THE AUTO-REDIAL RATE.
-
- ALT - LEFT-SHIFT TERMINATE BACKGROUND DIAL OR ENTER
- FILE TRANSFER STATUS SCREEN.
-
-
- V. TIPS ON USING THE INVISIBLE LINK
-
- 5.1 Getting The Most Out Of The Invisible Link
-
- As with any memory resident program, contention may occur when running
- with other memory resident programs. The only way to check compatibility
- is to test IL with that particular memory resident program. IL has been
- successfully tested with SIDEKICK(tm), SQZ(tm), CED(tm), and PRINT.COM to
- name a few. It is quite a sight to see a background transfer going on
- simultaneously with a background printing with no noticeable degradation
- to the foreground application program. Note that with disk intensive
- application programs such as DBASE(tm), you will probably notice more
- degradation than if you were using LOTUS 1-2-3(tm).
-
- Also, application programs that take over certain interrupts and are not
- well behaved may interfere with the background transfer. The only way to
- check compatibility is to try a background transfer or dial while using
- that particular program. You will probably know right away if IL is
- compatible with that program. IL has been extensively tested with DBASE
- III+(tm), LOTUS 1-2-3(tm) (ALL VERSIONS), MICROSOFT(tm) COMPILERS AND
- ASSEMBLER, TURBO PASCAL(tm), MANUSCRIPT(tm), AND NOVELL ADVANCED NETWARE
- 286(tm) VERSION 2.0.
-
- VI. ERROR MESSAGES
-
- INCORRECT DOS VERSION -- USE 2.0 OR ABOVE -- ABORTING! - IL requires DOS
- 2.0 or later.
-
- IL.COM NOT FOUND, DIRECTORY NOT UPDATED! - When loading IL, you probably
- did not specified the correct path (including extension) of where IL.COM
- is stored.
-
- TOO MANY ERRORS -- ABORTING! - IL has received 10 consecutive errors and
- is aborting the transfer of the current file in the queue.
-
- CANNOT OPEN FILE -- ABORTING! - IL could not open the file you wish to
- transfer. Make sure you have specified a valid path.
-
- COMM PORT OUTPUT ERROR -- ABORTING! - IL encountered a COMM port error.
-
- ERROR WRITING FILE -- ABORTING! - IL encountered a error while writing the
- transmitted file. This error usually occurs when you delete a file while
- it is being transmitted.
-
- ERROR READING FILE -- ABORTING! - IL encountered a error while reading the
- transmitted file. This error usually occurs when you delete a file while
- it is being transmitted.
-
-
- ** THE INVISIBLE LINK LICENSING AGREEMENT **
-
- The fully supported release version of THE INVISIBLE LINK is copyrighted
- material intended for use in unaltered form. Distribution of the release
- version of THE INVISIBLE LINK in any form is a violation of copyright. The
- program is provided "AS IS" without any warranty of any kind. Should the
- program prove defective, the user shall assume the entire cost of all
- necessary servicing, repair or correction. Site licensing of the release
- version of THE INVISIBLE LINK is available by arrangement with Robert
- Best. The release version of THE INVISIBLE LINK is intended for use on a
- single machine. Making copies for use on other machines represents a
- violation of this licensing agreement.
-
- A donation of $20.00 would be appreciated. This program is not public domain.
- The Invisible Link is marketed under the shareware concept. Send check or
- money order payable to Garland Wong in the amount of $20.00 to:
-
- Garland Wong
- 8663 Via Mallorca #86
- La Jolla, Ca, 92037
-
- If any party is interested in purchasing the full source code to THE
- INVISIBLE LINK, as well as the exclusive marketing rights to any
- derivative thereof, please contact Garland Wong at the above address to
- discuss terms.