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

  Terminates program execution and writes a message to SYS$OUTPUT.
  Statement format:

     STOP [disp]

     disp  Is a character constant or a string of up to
           six digits.  (FORTRAN-77 limits digits to five.)

  If you specify the optional argument "disp", the STOP statement
  displays the contents of "disp" at your terminal, terminates
  program execution, and returns control to the operating system.

  If you do not specify a value for "disp", the character constant
  FORTRAN STOP is displayed.