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X Window System ○˒｜Definition｜1st｜20260122103308-00-⌔

X Window System - Wikipedia

X Window System

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The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems. X originated as part of Project Athena at Massachusetts Institute of Technology (MIT) in 1984.1 The X protocol has been at version 11 (hence “X11”) since September 1987. The X.Org Foundation leads the X project, with the current reference implementation, X.Org Server, available as free and open-source software under the MIT License and similar permissive licenses.

Printed 2026-06-28.

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Footnotes

  1. Steiner, Jennifer G.; Geer Jr., Daniel E. (21 July 1988). “Network Services in the Athena Environment”. Proceedings of the Winter 1988 Usenix Conference. CiteSeerX 10.1.1.31.8727. ↩

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