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2 definitions found
 for Graphical User Interface
From WordNet (r) 3.0 (2006) :

  graphical user interface
      n 1: a user interface based on graphics (icons and pictures and
           menus) instead of text; uses a mouse as well as a keyboard
           as an input device [syn: graphical user interface, GUI]

From The Free On-line Dictionary of Computing (30 December 2018) :

  Graphical User Interface
      (GUI) The use of pictures rather than just
     words to represent the input and output of a program.  A
     program with a GUI runs under some windowing system
     (e.g. The X Window System, MacOS, Microsoft Windows,
     Acorn RISC OS, NEXTSTEP).  The program displays certain
     icons, buttons, dialogue boxes, etc. in its windows on
     the screen and the user controls it mainly by moving a
     pointer on the screen (typically controlled by a mouse)
     and selecting certain objects by pressing buttons on the mouse
     while the pointer is pointing at them.  This contrasts with a
     command line interface where communication is by exchange of
     strings of text.
     Windowing systems started with the first real-time graphic
     display systems for computers, namely the SAGE Project
     [Dates?] and Ivan Sutherland's Sketchpad (1963).  Douglas
     Engelbart's Augmentation of Human Intellect project at
     SRI in the 1960s developed the On-Line System, which
     incorporated a mouse-driven cursor and multiple windows.
     Several people from Engelbart's project went to Xerox PARC in
     the early 1970s, most importantly his senior engineer, Bill
     English.  The Xerox PARC team established the WIMP concept,
     which appeared commercially in the Xerox 8010 (Star) system
     in 1981.
     Beginning in 1980(?), led by Jef Raskin, the Macintosh
     team at Apple Computer (which included former members of the
     Xerox PARC group) continued to develop such ideas in the first
     commercially successful product to use a GUI, the Apple
     Macintosh, released in January 1984.  In 2001 Apple introduced
     Mac OS X.
     Microsoft modeled the first version of Windows, released
     in 1985, on Mac OS.  Windows was a GUI for MS-DOS that had
     been shipped with IBM PC and compatible computers since
     1981.  Apple sued Microsoft over infringement of the
     look-and-feel of the MacOS.  The court case ran for many

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