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

       /OBJECT[=filespec]
       /NOOBJECT

    Creates or omits an object module. It also defines the file
    specification. By default, the assembler creates an object module
    with the same file name as the first input file. The default file
    type for object files is OBJ. No wildcard characters are allowed
    in the file specification.

    The /OBJECT qualifier controls the defaults applied to the
    output file specification by the placement of the qualifier in
    the command line. For more information on entering output file
    qualifiers, see the OpenVMS User's Manual.