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The X Display Manager

The X Display Manager, xdm, runs as a daemon on a host machine. It provides a way for users to log on and start initial clients, regardless of what X server they use.

Not all sites use xdm to control X sessions. Many workstation users still prefer to log on as usual on the console and use the xinit program to start the X server and any preferred clients. xinit, however, is considered obsolete by the X Consortium, with all new functionality being built into xdm. And on a site that includes X terminals, xdm is an essential ...

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