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After typing in your login and password, XDM checks your home directory for a .xsession file. If you have a .xsession file, it is executed. If you do not have a .xsession file, then the file /usr/local/X11R5/lib/X11/xdm/.xsession is executed. In order to change the Window Manager that is started, or to modify the other programs that are started when you log in, you must have a .xsession file in your home directory.
The CS department supports one Window Manager: twm.
If you want to customize your X environment, you may copy the default startup files and modify them accordingly. Make sure you know what you are doing before modifying the default setup, because it is very easy to make a mistake that will prevent you from logging in. When in doubt, ask the tutor for assistance.
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