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- Hacking Arpanet -- Part V
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- by
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- The Source
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- PEEKING AND SPYING
- ------------------
-
- This article discusses the commands that "anonymous guest" can use do learn
- ghat other people are doing on the system.
-
- .HELP PK
- The PK program can be used to PeeK at the input and output buffers of any
- terminal, and the line editor buffer of a display. To run PK, give the monitor
- command "R PK". PK will ask for a terminal line number, and will display that
- terminal's buffers plus the who line of the job, if any, using that terminal.
- PK can also display the contents of some of the internal system variables
- assocZXW:%Q!the terminal (see + and - commands below3 the default is not to
- display this system data).
- If the selected terminal is hidden (by ESC H), PK will so notify you. You may
- choose to override the hiding, but if so, the selected terminal is notified that
- you are spying on it.
- If you are using a SAIL display, the selected terminal's buffers will be
- displayed on your screen about once per second, like a WHO display.
- If you are using a non-display, the PK information will be typed once.
- While PK is running on a display, you can give it any of the commands in the
- table below to have it display different information (in the table, <cr> means
- carriage return). Whenever PK exits on a DD or III, the last buffer display
- will remain on your screen until you reset your display by BREAK P or by running
- another program.
-
- <line number><cr> Display buffers of the given terminal line.
- +<line number><cr> Display given terminal line and enable data display.
- -<line number><cr> Display given terminal line and disable data display.
- <linefeed> Display buffers of the next higher numbered terminal.
- <altmode> Display buffers of the next lower numbered terminal.
- ^B^C<digit> Update the display NOW and every <digit> seconds (1:9).
- ^B^C0 Update the display NOW, then only once for each command.
- +<cr> Enable display of system internal data at top of screen.
- -<cr> Disable display of system internal data at top of screen.
- <cr> Stop the displaying and exit to the monitor.
- <monitor cmd> Exit and execute the given monitor command.
-
- .HELP PPK
- PPK allows you to peek at the screen of someone at a display terminal (a
- DataDisc, III or Datamedia). Say "R PPK", and give it the line number of the
- terminal you want to observe. (For DataDiscs, this is NOT the number reported
- by FINGEB; it's the number following the PPN in dhe person's wholine, and can be
- found with the WHERE command.)
- If you are on a display yourself and have your wholine terned on, PPK changes
- your wholine to be that of the job at which you're peeking. (Your original
- wholine selection is restored when you exit.)
- Once you have selected a lial "observe page printer" mode. (Do NOT follow the
- E or N with a carriage return, or PPK will exit!) Typing another line number
- followed by a carriage return gets you another victim. A raw carriage return
- causes the program to exit.
- If the selected terminal is hidden (by ESC H), PPK will so notify you. You may
- choose to override the hiding, but if so, the selected terminal is notified
- that you are spying on it.
- The display is updated about once every two seconds. You can force an
- immediate update by typing ALTMODE. You can also set the rate by typing
- control-meta-digit, where 1
- 9 = 1-9 secs and 0 causes the display never to be
- updated (except when you type ALTMODE).
-
- .HELP POLL
- POLL accepts an audio channel number and lists thOre tErminals which are
- listEnHnf to it, and the PPN, if someNne is logged in at that terminaL. An
- arguMdnt of * wilL list all nonzero audiO channEls.
- r poll
- CHANNEL=10
- TV-46: TTY53 JOB 41 [1,BH]
- TV-47: TTY64
- TV-51: TTY52 JOB 46 [1,CR]
- TV-63: TTY33 JOB 7 [SF,SF]
-
- .HELP TALK
- The command to communicate with another user is called TALK. It makes
- everything that either one of you types appear on both terminals. (Note: If
- you want to know about the TALK program on the Altos, READ DMCHAT, which
- describes both Alto DMCHAT and Alto TALK. The writeup below is for the TALK
- command on SAIL, which is completely different from Alto TALK.) The argument
- to TALK is either the programmer name of the person you want to talk to, the
- device name of the terminal you want to talk to, or an ARPAnet address. For
- example:
- TALK MRC
- TALK TTY34
- TALK RMS@AI (% is legal as a host name delimiter also),
- The command may fail for any of the following reasols:
- user not logged in (use MAIL)
- user logged in more than once (use a terminal instead of a user spec)
- user gagged or (for ARPAnet TALK) refusing links (use MAIL)
- the ARPAnet site is unreachable or does not support network linking
- When you are in a (local) talk ring, what you type goes only to the terminals
- in the ring, not to the monitor or a user program. To leave the talk ring,
- type [CALL] (control-C from non-displays).
- TALKing to local users does not run a program; hence the core image is
- preserved.
- TALKing to network users runs a program. To leave network talk, type
- <CONTROL><META>[LF] (control-Z from monitor. It is considered antisocial to
- use the TALK command to establish communication with strangers. A better way is
- the SEND command, which will send a message to a user but does not interfere
- with his work. For this reason, the TALK command requires that you be logged
- in. If you don't have an account, you can use SEND to request the user TALK
- to you. Type "HELP SEND" for more info.
-
- .HELP WHEN
- Typing WHEN prints out your most recent logout time, and the directory which
- did the logging out. The fact that you are currently logged in does not affect
- this information. As with FINGER, system crashes are not considered to be
- "loggig out". Also, if your directory was deleted when you logged out, it will
- not be included by WHEN. The WHEN command also takes optional arguments. If
- only a single argument is given, it may be typed as:
- WHEN FOO
- If more than one argument is used, separate them by semicolons, not commas. The
- various argument forms are:
- . Report only on current directory.
- * Give latest logouts for all of your directories.
- PRG Give latest logout from among PRG's directories.
- *,PRG Give logouts for all of PRG's directories.
- PRJ,* Give logouts for all directories with project PRJ.
- PRJ,PRG Give latest logout for the single directory [PRJ,PRG].
- *,* Give logout for every"%I
- Q=Ie(not recommended).
- Note that brackets are not included in any of the options. If you are aliased,
- the . and * options will use the aliased ppn. For example:
- WHEN DON;*;S,SYS;ME
- would tell you when DON last logged out (and from which of his directories),
- list all directories for you (or for whomever you're aliased to) with logout
- times, give the latest logout for [S,SYS], and finally tell you when ME last
- logged out.
- If one or more of the directories being listed happens to be logged in at the
- moment, a note will be printed to that effect. If you have asked for the
- latest from among all of someone's directories (including your own, which is
- the default), then you gill be told if that useb is logged in on ANY of his
- directories. (In the other cases, such as "*,PRG" or "PRJ,PRG" or "." options,
- you are told only if the specific directory is logged in.)
- Note that, even if you are not interested in the logout information, you can
- use WHEN *,FOO to get a list of all of FOO's directories. The other
- command for doing this is DIR [*,FOO]/Q/F. It turns out that WHEN is
- significantly faster and uses fewer disk ops. WHEN is also much faster than
- FINGER for finding out logout times or for finding out whether a specific person
- is currently logged in (though WHERE)
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