X Window System
From IEEE Bushy Tree
In computing, the X Window System (commonly X11 or X) is a windowing system which implements the X display protocol and provides windowing on bitmap displays. It provides the standard toolkit and protocol with which to build graphical user interfaces (GUIs) on most Unix-like operating systems and OpenVMS, and has been ported to many other contemporary general purpose operating systems.
X provides the basic framework, or primitives, for building GUI environments: drawing and moving windows on the screen and interacting with a mouse and/or keyboard. X does not mandate the user interface — individual client programs handle this. As such, the visual styling of X-based environments varies greatly; different programs may present radically different interfaces. X is built as an additional application layer on top of the operating system kernel.
Unlike previous display protocols, X was specifically designed to be used over network connections rather than on an integral or attached display device. X features network transparency: the machine where an application program (the client application) runs can differ from the user's local machine (the display server).
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| X Window System branch | ||
| Preceded by W Window System and V (operating system) | X Window System | Followed by --- |
| KDE 4.0 branch | ||
| Preceded by --- | X Window System | Followed by KDE 1.x |
| Xerox Alto branch | ||
| Influenced by Xerox Alto | X Window System | Influenced --- |
| Xerox Star branch | ||
| Influenced by Xerox Star | X Window System | Influenced --- |
| Cyrus Project branch | ||
| Influenced by Andrew Project | X Window System | Influenced --- |
| Mac OS X branch | ||
| Influenced by Macintosh and Apple Lisa | X Window System | Influenced --- |
| rio branch | ||
| Influenced by Blit | X Window System | Influenced rio |
| AmigaOS 4.0 branch | ||
| Influenced by --- | X Window System | Influenced Kickstart/Workbench 1.x |
| Solaris branch | ||
| Influenced by --- | X Window System | Influenced SunOS 1.x |
| SGI IRIX 6.x branch | ||
| Also includes --- | X Window System | Included in SGI IRIX 4.x |
