The stylized GNOME footprint on the is called
the Main Menu Button. Left-click on the button,
and you'll see a menu similar to Figure 2-7.
From here, you can start all the included applications and applets for
GNOME; you also have access to KDE applications, under , and to applications you would find in the
window manager AnotherLevel (provided that these applications were
installed in the first place).
These submenus give you access to a full range of applications on your
system -- in GNOME, KDE and AnotherLevel. If you prefer to use the GNOME
environment, but would rather use some non-GNOME applications, you can
easily choose them from the Main Menu Button.
From the Main Menu Button, you can also log out,
run applications from a command line and lock your
screen, which runs a password protected screensaver.