Graphical environment of an operating system. The Windows and Macintosh operating systems use a GUI. UNIX and DOS are command line operating systems.

industrial term referring to the graphical screen format of an operating system.

A graphical interface where the user uses a mouse, keyboard, icons, and menus to send commands to the CPU. Non-GUI systems would include MS-DOS which required typed commands such as "format a:" to format a disk.

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