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Unless your home is free of any form of technology, you probably use some form of the nearly ubiquitous Windows operating system on a daily basis. Since 1985 the Microsoft Windows operating system has gone through a lot of changes, with new and improved versions being released on a regular basis. A graphical interface operating system, Windows was originally released as an add-on to MS-DOS in response to a growing interest in an operating system that had a graphical user interface instead of just a command line. Early versions include Windows 3.0/3.1, Windows 95/98, and Windows NT, all of which look vastly different from the user interface of the later versions, such as XP and Vista, which most users are accustomed to. The XP operating system comes in two distinct editions: Home and Professional, with the Professional version coming equipped with more advanced security and networking features that differentiate it from the basic Home version. XP was followed by Windows Vista, which included a variety of new features including a redesigned shell and user interface to major technical changes, with a focus on improving the operating systems security features. Vista was in time replaced with the release of Windows 7, which was intended to be an incremental upgrade to the Windows operating systems line. Unlike earlier versions, it has multi-touch support, a redesigned Windows shell with a new taskbar, and performance improvements. Windows 8, the successor to Windows 7, is the first operating system in the Windows line that is designed to run on both PCs and tablet devices. It also features a complete redesign in the graphical user interface. The start button has been removed and replaced with a Start screen: a feature that may take some getting used to by those accustomed to the functionality of the earlier Windows operating systems.