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Windows® 8.1 IN DEPTH by Paul McFedries, Brian Knittel

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A. Virtualization

A virtual machine (VM) program simulates the hardware functions of a computer within an application running on another computer. It lets you run an entire operating system as an application program, so that you can work in various operating systems without rebooting. Virtualization has been used on big mainframe computers since the 1960s, and it is now also used on PCs and PC-type server computers. If you use Windows 8.1, you could conceivably have Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1, various versions of Windows Server and Linux, and other operating systems all running at once, on your desktop. You can also run a copy of Windows inside a virtual computer on a machine running Linux, Mac OS X, or other ...

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