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and the user could delete files and folders by dragging them to a trash can on the screen. There is still some controversy over the amount of influence that Xerox’s PARC work, as opposed to previous academic research, had on the GUIs of Apple’s Lisa and Macintosh, but it is clear that the influence was extensive. The Macintosh’s GUI has been revised with time since 1984, with a major update with System 7, and underwent its largest revision with the introduction of the Aqua interface in 2020’s Mac OS X. VisiOn Graphical user interface primarily designed for spreadsheets by the pany that wrote the legendary VisiCalc spreadsheet. First introduced the windows concept and a mouse to the PC environment, in 1983. Preceded the first Microsoft Windows implementations. VisiOn never took off because it could not be used to run other MSDOS applications and was buggy and expensive. Inspired the multitasking system DESQview. Amiga Intuition Amiga puters developed a GUI in 1985 called Intuition. In this GUI directories were shown as filing cabi drawers. The Amiga GUI was unique for its time because it featured a popup mand line interface (CLI) for those times when a GUI does not offer enough control. GEM At the same time Microsoft was developing Windows in the 1980s, Digital Research developed the GEM Desktop GUI system. GEM was created as an alternative window system to run on IBM PC systems, either on top of MSDOS (like Microsoft Windows) or on top of CPM86, DR’s own operating system that MSDOS was patterened after. GEM achieved minimal success in the PC world, but was later used as the native GUI on the Atari ST machines. GEOS GEOS was another very early graphical desktop system. Originally written for the 8 bit home puter Commodore 64 it was later ported to IBM PC systems. It came with several application programs like a calendar and word processor, and a cutdown version served as the basis for America Online’s DOS client. Compared to the peting Windows GUI, it could run reasonably well on simpler hardware. Revivals were seen in the HP OmniGo handhelds, Brother GeoBook line of laptopappliances, and the New Deal Office package for PCs. Related code found its way to earlier ’Zoomer’ PDAs, creating an unclear lineage to Palm, Inc’s later work. Microsoft Windows Microsoft modeled the first version of Windows, released in 1985, on the GUI of the Mac OS. Windows was a GUI (graphic user interface) for the MSDOS operating system that had been the standard OS for with IBM PC and patible puters since 1981. Windows followed, then in 1990 the Windows launch was when the popularity of Windows really exploded. The GUIs of subsequent versions of Windows have been similar to the GUI of Windows . In 1988, Apple sued Microsoft for copyright infringement of the Lisa and Apple Macintosh GUI. The court case lasted 4 years before almost all of Apple’s claims were denied. Subsequent appeals by Apple were also denied, and Microsoft and Apple apparently entered a final, private settlement of the matter in 1997 as a side note in a broader announceme