XDM (display manager)

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The X Display Manager (XDM) is the default display manager for the X Window System. It is a bare-bones X display manager. It was introduced with X11 Release 3 in October 1988, to support the standalone X terminals that were just coming onto the market. It was written by Keith Packard. XDM is used to boot an X.org based desktop environment. It can control a display directly or indirectly in order to start an X session and supports remote login. XDM is initialized on system startup. It can be edited through the use of a configuration file, modules, or scripts. The configuration file is usually found in /usr/lib/X11/xdm/xdm-config. XDM is one of the earliest display managers for Linux.