1.4 Switching Desktops
If more than one desktop environment is installed on your system (for
example, KDE and GNOME, or KDE 3.5.x and KDE
4), you can choose to switch to another desktop when logging in again (or
when logging in as a different user). To do so, proceed as follows:
On the login screen, click and select
the desktop environment to start.
Enter a valid username and password. A new session on the selected
desktop environment starts.
To switch back again, log out from the current desktop and select a
different on the login screen. If you
do not select a new session type, your next session will be of the same
type as the session before.