X

X
X is an ambiguous term. The two most common meanings are:

The X Window System, a graphical user interface system popular on Unix systems.

Mac OS X, that is, version 10 of MacOS, made by Apple Computer. MacOS X does not run on top of the X Window System, instead relying on its own GUI system called Aqua. But, an X workstation system is available on X.3 Panther and later.

x permission
See Execute Permission and Search Permission.

X Window System
The X Window System is a graphical user interface system used on most Unix computer systems. As of the year 2002, the latest version is X11R6. X and The X Window System are registered trademarks of The Open Group.

A fundamental feature of X is network operability. That is, the X workstation, where the human sees windows on a graphical screen, and operates a keyboard and mouse, can be on a different machine from where the actual application program is running. These are connected usually by a TCP/IP network. (Confusingly, the X workstation is called the "X server" and the application is called the "X client".)

For more information, contact www.x.org, the X/Open Group. One of the most popular implementations is XFree86, at xfree86.org, available on almost all Linux and FreeBSD distributions.



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