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Windows 7 has got a feature called Aero Peek which is enabled when the Aero desktop experience or theme is used. The Aero Peek is used to view the Desktop temporarily without minimizing all open windows or applications, this is particularly useful when we just want to have a quick look at the Desktop and are too lazy to minimize all the windows. Below is the screenshot of Windows Aero Peek feature.

Before Aero Peek is Enabled: (click to enlarge)

After Aero Peek is Enabled: (click to enlarge)

How to use Windows 7 Aero Peek Feature

The Aero Peek can be activated using keyboard shortcut Windows Key + spacebar and if you point your mouse to the extreme right hand side of the taskbar you can find the show Aero Peek button. (refer to the screenshot below)

How to Preview a Open file or Window using Aero Peek

Using Aero Peek you can preview or peek at a open file or open window quickly. Point your mouse pointer to the program or open window icon in the task bar and then point to the thumbnail that pops up. Now all other open windows or files will fade only the program or file that you selected will be displayed. In below screenshot see it in action: (click to enlarge)

In case you have questions please post it in comment sections.