The stylized GNOME footprint on the panel is the Main Menu
Button. Left-click on the button to expand it.
From here, you can start all the included applications and applets for
GNOME (or use Nautilus—see the section called The Nautilus File Manager); you also have access to KDE applications,
under (if KDE is installed on your machine).
These submenus give you access to a full range of applications on your
system. 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.
