Source : Free On-Line Dictionary of Computing

Lotus 1-2-3
     
         A {spreadsheet} for {MS-DOS} from {Lotus
        Development Corporation}.  It can be programmed using
        "{macro}s" and comes with a separate program to produce graphs
        and charts but this cannot be run at the same time as the
        spreadsheet.  It has keyboard-driven {pop-up menu}s as well as
        one-key commands, making it fast to operate.  Lotus 1-2-3
        supported {EGA} and later {VGA} graphics.  Early versions used
        the {filename extension} "WK1".
     
        Version: 4.
     
        Lotus 1-2-3 has been the subject of several {user interface
        copyright} court cases in the US.
     
        {Home (http://www.nyweb.com/lotus/123.html)}.
     
        1-2-3's successor, {Symphony}, had simultaneous update of
        spreadsheet, graph and {word processor} windows.
     
        (1995-11-28)