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Full Discussion: DISPLAY Environment Variable
Top Forums UNIX for Dummies Questions & Answers DISPLAY Environment Variable Post 302433753 by fpmurphy on Wednesday 30th of June 2010 11:18:59 AM
Old 06-30-2010
From a X(7) man page:

Quote:
From the user's perspective, every X server has a display name of the form:

hostname:displaynumber.screennumber

This information is used by the application to determine how it should connect to the server and which screen it should use by default (on displays with multiple monitors):

hostname
The hostname specifies the name of the machine to which the display is physically connected. If the hostname is not given, the most efficient way of communicating to a server on the same machine will be used.
displaynumber
The phrase "display" is usually used to refer to collection of monitors that share a common keyboard and pointer (mouse, tablet, etc.). Most workstations tend to only have one keyboard, and therefore, only one display. Larger, multi-user systems, however, frequently have several displays so that more than one person can be doing graphics work at once. To avoid confusion, each display on a machine is assigned a display number (beginning at 0) when the X server for that display is started. The display number must always be given in a display name.
screennumber
Some displays share a single keyboard and pointer among two or more monitors. Since each monitor has its own set of windows, each screen is assigned a screen number (beginning at 0) when the X server for that display is started. If the screen number is not given, screen 0 will be used.
Note that an IP address can be used instead of a hostname.
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LEARN ABOUT DEBIAN

propwatch

propwatch(1)						      General Commands Manual						      propwatch(1)

NAME

       propwatch - a tool to monitor X11 properties

SYNOPSIS

       propwatch [ options ] property-name ...

DESCRIPTION

       propwatch is a tool to monitor window properties of root and application windows.  Nice for debugging property-based IPC of X11 programs.

OPTIONS

       propwatch uses the Athena Widgets and accepts the usual toolkit options like -display and -geometry.

       Additional options are:

       -watch display
	      Display  to  monitor  the windows on.  By default the display specified in the DISPLAY environment variable or via -display is used,
	      but it is possible to watch another display instead.

       -verbose
	      be verbose.

       -proplog
	      Log property changes to stdout.

       -kbdlog
	      Log keystrokes to stdout.

       All remaining command line arguments are assumed to be property names which should be monitored.  If no property  names	are  specified,  a
       build in default (WM_COMMAND) will be used.

ENVIRONMENT

       DISPLAY
	      specifies the display to use for the propwatch window.

SEE ALSO

       xprop(1), xhost(1), xauth(1), xwd(1)

AUTHOR

       Gerd Knorr <kraxel@bytesex.org>

COPYRIGHT

       Copyright (C) 1997-2003 Gerd Knorr
       This  program  is  distributed  in  the	hope  that  it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

							     (c) 1997-2003 Gerd Knorr						      propwatch(1)
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