xdm
xdm is a graphical login manager for the X-Windows system. When it is run, at system startup, it displays a graphical login prompt rather than the text-based login prompt at the console. The graphical login prompt is similar to a Windows NT/2000 login screen.
If you want to use xdm, you should create a file called .xsession in your home directory. This file is the xdm equivalent of the .xinitrc file that the console login uses. It should contain the command to start your desired window manager, as well as the commands to start any applications you want to run automatically at boot time. All the commands in the .xsession file should end with an & so they start in the background. The following is what a sample .xession file could look like: ...
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