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XKIBITZ(1)		    General Commands Manual		    XKIBITZ(1)

       xkibitz - allow multiple	people to interact in an xterm

       xkibitz [ xkibitz-args ]	[ program program-args...  ]

       xkibitz allows users in separate	xterms to share	one shell (or any pro-
       gram that runs in an xterm).  Uses include:

	      o	  A novice user	can ask	an expert user for help.  Using	 xkib-
		  itz,	the  expert  can see what the user is doing, and offer
		  advice or show how to	do it right.

	      o	  By running xkibitz and then starting a  full-screen  editor,
		  people  may  carry out a conversation, retaining the ability
		  to scroll backwards, save the	entire conversation,  or  even
		  edit it while	in progress.

	      o	  People  can team up on games,	document editing, or other co-
		  operative tasks where	each person has	 strengths  and	 weak-
		  nesses that complement one another.

	      o	  If  you  want	to have	a large	number of people do an on-line
		  code walk-through, you can sit two in	front of each worksta-
		  tion,	 and then connect them all together while you everyone
		  looks	at code	together in the	editor.

       To start	xkibitz, one user (the master) runs xkibitz with no arguments.

       xkibitz starts a	new shell (or another program, if given	on the command
       line).  The user	can interact normally with the shell, or upon entering
       an escape (described when xkibitz starts) can add users to the interac-

       To  add	users,	enter "+ display" where	display	is the X display name.
       If there	is no ":X.Y" in	the display name, ":0.0" is assumed.  The mas-
       ter  user must have permission to access	each display.  Each display is
       assigned	a tag -	a small	integer	which can be  used  to	reference  the

       To show the current tags	and displays, enter "=".

       To drop a display, enter	"- tag"	where tag is the display's tag accord-
       ing to the "=" command.

       To return to the	shared shell, enter "return".  Then the	keystrokes  of
       all  users become the input of the shell.  Similarly, all users receive
       the output from the shell.

       To terminate xkibitz it suffices	to terminate the  shell	 itself.   For
       example,	 if  any user types ^D (and the	shell accepts this to be EOF),
       the shell terminates followed by	xkibitz.

       Normally, all characters	are passed uninterpreted.  However, in the es-
       cape  dialogue the user talks directly to the xkibitz interpreter.  Any
       Expect(1) or Tcl(3) commands may	also be	given.	Also, job control  may
       be  used	 while in the interpreter, to, for example, suspend or restart

       Various processes can produce various effects.  For  example,  you  can
       emulate a multi-way write(1) session with the command:

	    xkibitz sleep 1000000

       xkibitz	understands a few special arguments which should appear	before
       the program name	(if given).  Each  argument  should  be	 separated  by
       whitespace.   If	the arguments themselves takes arguments, these	should
       also be separated by whitespace.

       -escape sets the	escape character.  The default escape character	is ^].

       -display	adds a display much like the "+" command.   Multiple  -display
       flags  can be given.  For example, to start up xkibitz with three addi-
       tional displays:

	    xkibitz -display mercury -display fox -display dragon:1.0

       Due to limitations in both X and	UNIX, resize propagation is weak.

       When the	master user resizes the	xterm, all the other xterms are	 logi-
       cally  resized.	Unfortunately, xkibitz cannot force the	physical xterm
       size to correspond with the logical xterm sizes.

       The other users are free	to resize their	xterm but their	sizes are  not
       propagated.   The  master can check the logical sizes with the "=" com-

       Deducing	the window size	is a  non-portable  operation.	 The  code  is
       known  to  work	for  recent  versions of SunOS,	AIX, Unicos, and HPUX.
       Send back mods if you add support for anything else.

       The environment variable	SHELL is used to determine and start a	shell,
       if no other program is given on the command line.

       If  the	environment variable DISPLAY is	defined, its value is used for
       the display name	of the xkibitz master (the display with	tag number 0).
       Otherwise this name remains empty.

       Additional  arguments  may be passed to new xterms through the environ-
       ment variable XKIBITZ_XTERM_ARGS.  For example, to create xterms	with a
       scrollbar and a green pointer cursor:

	    XKIBITZ_XTERM_ARGS="-sb -ms	green"

       (this  is for the Bourne	shell -	use whatever syntax is appropriate for
       your favorite shell). Any option	can be given that  is  valid  for  the
       xterm  command,	with  the  exception  of -display, -geometry and -S as
       those are set by	xkibitz.

       Tcl(3), libexpect(3) kibitz(1)
       "Exploring Expect: A Tcl-Based Toolkit for Automating Interactive  Pro-
       grams" by Don Libes, O'Reilly and Associates, January 1995.
       "kibitz	-  Connecting  Multiple	Interactive Programs Together",	by Don
       Libes, Software - Practice & Experience,	John Wiley & Sons,  West  Sus-
       sex, England, Vol. 23, No. 5, May, 1993.

       Don Libes, National Institute of	Standards and Technology

				06 October 1994			    XKIBITZ(1)


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