Multiple Desktops
The Mission Control feature in Mac OS X allows you to arrange windows into several different screens you can quickly switch between. This feature was formerly known as Spaces, and is called virtual desktops or workspaces on Linux.
For example, you could have a desktop for work programs and a desktop for personal applications. When you want to switch between work and play, you can simply switch virtual desktops without having to move all those windows around.
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