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A collection of programs which, together, manage all the basic functions of a computer. The operating system runs other programs (such as a word processor or graphics editor), manages the storage of your own documents, and coordinates the functions of the computer itself and all the devices connected to the computer. Windows Me, Mac OS and Linux are three examples of operating systems. A program written to work under one operating system will not work on another operating system (a different version must be written for each operating system - such as Microsoft Office for Windows and Office for the Mac.