Source : Free On-Line Dictionary of Computing

ezd
     
         (Easy drawing) A graphics {server} that sits
        between an {application program} and an {X} server and allows
        both existing and new programs easy access to structured
        graphics.  Ezd users have been able to have their programs
        produce interactive drawings within hours of reading the
        manual page.  Ezd supports structured graphics - application
        defined graphical objects are ordered into drawings by the
        application.  Unlike most X tools, ezd does not require any
        event handling by the application.  The ezd server maintains
        the window contents.  When an event occurs an application
        supplied {Scheme} expression is evaluated.
     
        Current version: 15mar93 (as of 1993-03-10).
     
        {(ftp://gatekeeper.dec.com/pub/DEC/ezd/)}.
     
        Contact: Joel Bartlett.
     
        (2000-03-25)