The networkable, standards-based graphical system used on Unix-based workstations. It is comprised of several interchangeable components:
* XwindowProtocol
* XwindowServer
* WindowManager
* client libraries (Xlib, XCB) and toolkits (GNOME, KDE) used by applications

References:
* http://x.org/X11_clientdesign.html
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CategoryXwindow