Source : Free On-Line Dictionary of Computing

Application environment specification
     
         (AES) A set of specifications from {OSF} for
        programming and {user interfaces}, aimed at providing a
        consistent application environment on different hardware.  It
        includes "O/S" for the {operating system} (user commands and
        program interfaces), "U/E" for the User Environment ({Motif}),
        and "N/S" for Network services.
     
        [Reference?]
     
        (1994-12-07)