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XQuartz is an open-source version of the X.Org X server, a display server for the X Window System (sometimes shortened to X11 or X) that runs on macOS. [1] In 2012, it formally replaced Apple's internal X11 app for OS X Mountain Lion (version 10.8).
Version 4.0 also moved to a new driver model, from one X server binary per driver to a unique X server capable of loading several drivers at a time. Because the server usually needs low level access to graphics hardware, on many configurations it needs to run as the superuser, or a user with UID 0. However, on some systems and configurations it ...
In the X Window System, programs run as X clients, and as such they connect to the X display server, possibly via a computer network.Since the network may be accessible to other users, a method for forbidding access to programs run by users different from the one who is logged in is necessary.
In this situation, the display manager works like a graphical telnet server: an X server can connect to the display manager, which starts a session; the applications which utilize this session run on the same computer of the display manager but have input and output on the computer where the X server runs (which may be the computer in front of ...
The X server is typically the provider of graphics resources and keyboard/mouse events to X clients, meaning that the X server is usually running on the computer in front of a human user, while the X client applications run anywhere on the network and communicate with the user's computer to request the rendering of graphics content and receive ...
X.Org Server is the free and open-source implementation of the X Window System (X11) display server stewarded by the X.Org Foundation. Implementations of the client-side X Window System protocol exist in the form of X11 libraries , which serve as helpful APIs for communicating with the X server. [ 4 ]
The xinit program allows a user to manually start an X display server. The startx script is a front-end for xinit. By default, xinit and startx start an X display server pointing to a display device that is enumerated as :0 and then start an xterm on it. When the xterm terminates, xinit and startx kill the X display server.
From the point of view of the X client app, it acts exactly like any other X display server, serving requests and sending events and errors as appropriate. However, no output is shown. This virtual server does not require the computer it is running on to have any kind of graphics adapter, a screen or any input device. Only a network layer is ...