VMS Help MMS, Description File, Reserved-Macros  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    MMS                  Used to invoke MMS from a description file.
    MMSALPHA             Defined as 'Alpha' if MMS is running on Alpha.
    MMSARCH_NAME         The architecture name on which MMS is running
                             (i.e. 'Alpha' or 'VAX').
    MMSDESCRIPTION_FILE  The full file specification of the description
                         file specified (or implied) by the command line.
    MMSQUALIFIERS        The command line qualifiers used to invoke MMS.
    MMSTARGETS           The target list specified on the command line.
    MMSVAX               Defined as 'VAX' if MMS is running on VAX.

    Note: the MMSVAX and MMSALPHA macros can be used with the .IFDEF
          directive to include description file lines that should only be
          processed for the appropriate architecture.