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    I think you should probably go to the conversation page corresponding to that page in Wikipedia and start a conversation aiming for the authors to clarify their article. Commented Apr 13, 2016 at 12:47
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    Wikipedia is great, but it caters "power-users" first and tend to give detailed information first instead of short and concise answers first, then detailed informations. Commented Jun 29, 2021 at 12:04
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    X11 is also a OSI level 7 protocol ie the format of the datastream over the network and its semantics. An application can be programmed using libX11 or libxcb directly (a basic low level programming API for a GUI.) libX11 uses the network format to communicate with a server ie a program having command of a screen and access to a data stream from keyboard(s) and mouse(s.) libXt is a library which together with a number of widgets implements a more high-level API. The older versions of Gtk replaces libXt but depends on libX11 - it doesn't communicate directly with the server. Commented Jun 29, 2021 at 18:39
  • @Stefan Skoglund But if an application does what you say - using libX11 or libxcb - then aren't they simply using X's internal fallback libraries to build their user interface ? The statement Programs may use X's graphical abilities with no user interface clearly implies the absurd scenario of an app without any user interface seeking to use X . . . Commented Jul 15, 2021 at 13:03
  • I've edited the absurd sentence in the Wikipedia page. Feel free to improve it. Commented Jul 15, 2021 at 13:12