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Windows 10's multiple desktop feature has caused a lot of confusion which is due in part to its name. You might think that "multiple desktop" means multiple monitors, but it's more of a virtual multi-monitor feature.
The Windows 10 multi-display feature provides multi-monitor-like capabilities to those who have only a single monitor. The feature essentially adds desktop real estate without requiring any new hardware. A similar feature already exists in some Linux builds, so the idea is not entirely new.
The multi-display feature allows the user to have multiple views of the Windows desktop. Controls at the bottom of the screen let users choose which view they want to look at and toggle between virtual monitors. If a user launches an application, he can place that application on any of the virtual monitors. That way, he can run the application without cluttering the primary display area.
In a business environment, the multi-display feature can help users work more efficiently. A user might have email open in one virtual display while he runs a line of business application in another. The user can easily create even more virtual displays if necessary.
The multi-display feature is set up in a way that allows the user to switch between virtual monitors without worrying about minimizing and restoring windows. User can arrange their open windows in a way that makes the most sense for the way that they work.