Source : Free On-Line Dictionary of Computing

Adaptable User Interface
     
         (AUI, Oracle Toolkit) A toolkit from {Oracle}
        allowing applications to be written which will be portable
        between different {windowing systems}.  AUI provides one {call
        level interface} along with a resource manager and editor
        across a range of "standard" {GUI}s, including {Macintosh},
        {Microsoft Windows} and the {X Window System}.
     
        (1995-03-16)