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XDM (the X Window Display Manager) originated in X11R3. This version suffered from several problems, most notably when users switched X terminals off and on. In X11R3, XDM only knew about an X terminal from its entry in the Xservers file, but XDM only consulted this file when it started. Thus every time a user switched a terminal off and on, the system administrator had to send a SIGHUP signal to XDM to instruct it to rescan Xservers

["display manager"] >


XDM (the X Window Display Manager) originated in ?X11R3. This version suffered from several problems, most notably when users switched X terminals off and on. In ?X11R3, XDM only knew about an X terminal from its entry in the Xservers file, but XDM only consulted this file when it started. Thus every time a user switched a terminal off and on, the system administrator had to send a SIGHUP signal to XDM to instruct it to rescan Xservers