VMS Help FORTRAN, /PARALLEL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /[NO]PARALLEL=(option[,...])     D=/PARALLEL=(NOAUT,NOMAN) or /NOPAR

  Controls whether the compiler performs special processing for
  parallel-processing applications.

  Specifying /NOPARALLEL or /PARALLEL=(NOAUTOMATIC,NOMANUAL) has the
  same effect as omitting the /PARALLEL qualifier.  Compiler
  directives relating to parallel processing (CONTEXT_SHARED,
  DO_PARALLEL, LOCKON, LOCKOFF, PRIVATE, and SHARED) are treated as
  comments and no object code is generated to support execution of
  parallel DO loops.

  Specifying /PARALLEL without any options has the same effect as
  specifying /PARALLEL=(MANUAL,AUTOMATIC).

1 - AUTOMATIC

  Controls whether the compiler automatically decomposes DO loops to
  run in parallel mode on multiprocessor systems.

  /PARALLEL=AUTOMATIC cannot be used with /CHECK=BOUNDS and
  /NOOPTIMIZE.

2 - MANUAL

  Controls whether the compiler parses CPAR$ directives and generates
  parallel code for loops preceded by CPAR$ DO_PARALLEL.

3 - ALL

  Same interpretation as /PARALLEL=(MANUAL, AUTOMATIC) (or
  /PARALLEL).

4 - NONE

  Same interpretation as /PARALLEL=(NOMANUAL, NOAUTOMATIC) (or
  /NOPARALLEL).