You can use a utility called Switchdesk, which
allows you to change to and from GNOME, KDE and other environments.
You can use Switchdesk from either the shell prompt
or from the login screen.
From the shell prompt: Open an Xterm window and type
A window will appear (see Figure 7-1)
showing you the choices of environments you can select, under
Available Desktops. Once you select your new
environment, click on OK.
To see your changes take effect, you'll have to log out, then log
back in.
From the login screen: You'll select other alternative environments
under =>
. Again, you can select a variety
of environments.
Now, just type in your name and password, and log in as usual.