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About windows xp/vista/7/8/10
1. Microsoft Windows is a group of several graphical operating system
families, all of which are developed, marketed, and sold by
microsoft.
2. Windows family include windows 7, 8, 10, vista, xp.
3. Microsoft introduced an operating environment named Windows on
November 20, 1985, as a graphical for MS-DOS in response to the
growing interest in graphical user interfaces.