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Compare and decide - Microsoft Windows
Compare Windows 8, Windows 8 Pro, and Windows RT to see which one is right for you.
Add features to Windows 8: FAQ - Microsoft Windows Help
Get answers to questions about how to use Add features to Windows 8, including how much it costs and where to get a product key.
Add features - Microsoft Windows
Add Windows Media Center to Windows 8 so you can watch and record live TV. Get Windows 8 Pro pack or Windows 8 Media Center Pack.
Turn Windows features on or off
Learn how to turn on or off programs, features, and tools that are included with Windows.
What features does my app have permission to use? - Microsoft Windows Help
Learn how to view which features an app has permission to use before you install it from the Windows Store.