VMS Help DCE_IDL, DCL Command Interface, QUALIFIERS, /STANDARD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

      /STANDARD [=[NO]PORTABLE | DCE_V10 | DEC_V10 | EXTENDED ]
      /STANDARD=PORTABLE (default)

        This qualifier is equivalent to the -standard[standard_type]
        argument in the universal syntax.  This universal syntax
        argument is documented in the section of the Compaq DCE
        Product Guide that describes additional IDL command options.