The desktop environment used in Tails is [GNOME](https://www.gnome.org).This page describes some important features of the desktop in the context of Tails.
Click on the [[!img lib/system-shutdown.png alt="Power Off" class="symbolic" link="no"]] button to shut down your computer.The Activities button [[!img lib/activities.png class="symbolic" link="no" alt=""]]
The shape of the Activities button represents your workspaces, the grouping of windows on your desktop. For example, below is the shape of the Activities button if you have 3 workspaces and the second workspace is the one that it displayed right now.
Throw your mouse pointer to the upper-left corner of the screen.
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Click onPress the [[!img lib/system-shutdown.png alt="Power Off" class="symbolic" link="no"]] button to shut down your computertart.png class="symbolic" link="no" alt="Super"]] key on your keyboard.