There is abundant opportunity to customize the X Windows System GUI. In Redhat Linux, one can configure everything from the X server's graphical login to the finest details of your window manager's window appearance and behavior.
Working with the X server, the window manager allows you to use the interface in an intuitive way. Your choice of window manager determines the GUI's basic behavior, and you may change this behavior through your window manager's configuration.
Because of the X Windows System's client/server model, you can configure your display to show remote X clients running on your X server. You can manipulate X windows running on a machine next door or around the world, even over a modem.

After completing this module, you will be able to:

1. Explain how resources are organized into classes
2. Use the .Xdefaults file to customize the look and feel of X applications
3. Use the GNOME Display Manager to manage X sessions
4. Explain the need for a window manager to get the most out of X
5. List the characteristics of various window managers
6. Use the GNOME Control Center to select a window manager
7. Run remote X clients on the local machine
8. List common X problems and explain how to solve them