/sys$common/syshlp/helplib.hlb MMS, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    MMS accepts an optional list of targets to  build.   If  you  do  not
    specify  a  target  on  the  command  line, and if you do not specify
    /NODESCRIPTION,  MMS  tries  to  build  the  first  target   in   the
    description  file.   If  you do not specify the name of a description
    file,  MMS  attempts  to  process  the   default   description   file
    DESCRIP.MMS;  if it does not exist, MMS attempts to process MAKEFILE.
    If   MAKEFILE.    does   not   exist,   MMS   attempts   to   process
    target-name.MMS.    If   all   these   files  exist,  MMS  uses  only
    DESCRIP.MMS.  If none of these files exist, MMS uses  built-in  rules
    to build the target.

    If you specify the target on  the  command  line,  MMS  looks  for  a
    description  file with the same name and builds that target directly.
    If you specify /NODESCRIPTION, MMS does not look  for  a  description
    file but uses its built-in rules to build the target specified on the
    command line.

    When generating a description file, MMS accepts a list of sources that
    will be scanned for dependencies.