The operating system software makes the computer perform its basic operational functions. Disk operating system (DOS) is one of the earlier types of operating system software used to power IBM-compatible computers. Commands are typed at a prompt to direct the computer to carry out its functions.
Windows is the most common operating system today. It permits several programs to be opened simultaneously and provides ease of movement between the open programs.
Windows NT is used for business networks. Once this operating system is downloaded and running, other kinds of software are opened to perform the desired functions.
The Macintosh Operating System (Mac OS) is designed for use with Apple, Mac, and Power Mac computers. One disadvantage of Mac OS is that fewer programs have been written for it compared to the number written for DOS or Windows.
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