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Possible Duplicate:
How can I reduce or increase the number of workspaces in Unity?

This video from a Unity developer shows him clicking on the workspace button in the launcher to use multiple workspaces (aka virtual desktops). On my 2 netbooks clicking on that button only invokes the expose-like effect.

Is there a setting somewhere I can use to get this functionality, and if so, what is the keyboard shortcut to go along with it?