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

  Transfers control and passes arguments to a subprogram.

     CALL sub[([a][,[a]]...)]

     sub  Is the name of a subroutine, or other external
          procedure, or a dummy argument associated with
          a subroutine subprogram or other external procedure.

     a    Is a value to be passed to the subroutine.

  If you specify an argument list, the CALL statement associates the
  values in the list with the dummy arguments in the subroutine.  It
  then transfers control to the first executable statement following
  the SUBROUTINE or ENTRY statement referenced by the CALL statement.

  The arguments in the CALL statement must agree in number, order,
  and data type with the dummy arguments in the subroutine.  They can
  be variables, arrays, array elements, records, record elements,
  record arrays, record array elements, substring references,
  constants, expressions, Hollerith constants, alternate return
  specifiers, or subprogram names.  An unsubscripted array name or
  record array name in the argument list refers to the entire array.

  An alternate return specifier is an asterisk (or ampersand)
  followed by the label of a statement in the program unit containing
  the CALL statement.

  Compaq Fortran allows direct or indirect recursive calls to
  subroutines, if you specify the /RECURSIVE compiler option.