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The first principle was modified during the design of X11 to: ''"Do not add new functionality unless you know of some real application that will require it."'' X has largely kept to these principles since. The reference implementation is developed with a view to extension and improvement of the implementation, whilst remaining almost entirely compatible with the original 1987 protocol.
==User interfaces==▼
{|border=0 align=left
|[[Image:Solaris8-cde.png|thumb|200px|[[Common Desktop Environment|CDE]] on [[UNIX]] ([[Solaris Operating Environment|Solaris]] 8)]]
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|[[Image:DECwindows-openvms-v7.3-1.png|thumb|200px|DECwindows CDE on [[OpenVMS]] 7.3-1]]
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▲==User interfaces==
X deliberately contains no specification as to application [[user interface]], such as [[button (computing)|button]]s, [[menu (computing)|menu]]s, window [[title bar]]s and so on. These are provided by user software, such as [[window manager]]s, GUI [[widget toolkit]]s and [[desktop environment]]s, or application-specific GUIs, such as [[point of sale]]. As such, the "typical" X interface has varied tremendously over the years.
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