/sys$common/syshlp/helplib.hlb LBR Routines, LBR$SET_MODULE, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 library_index

    OpenVMS usage:longword_unsigned
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference
    Library control index returned by the LBR$INI_CONTROL routine.
    The library_index argument is the address of the longword that
    contains the index.

 rfa

    OpenVMS usage:vector_longword_unsigned
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference
    Record's file address (RFA) associated with the module header.
    The rfa argument is the address of a 2-longword array containing
    the RFA returned by LBR$PUT_RECORD or LBR$LOOKUP_KEY.

 bufdesc

    OpenVMS usage:char_string
    type:         character string
    access:       write only
    mechanism:    by descriptor
    Buffer that receives the module header. The bufdesc argument
    is the address of a string descriptor pointing to the buffer
    that receives the module header. The buffer must be the size
    specified by the symbol MHD$B_USRDAT plus the value of the
    CRE$L_UHDMAX create option. The MHD$ and CRE$ symbols are
    defined in the modules $MHDDEF and $CREDEF, which are stored
    in SYS$LIBRARY:STARLET.MLB.

 buflen

    OpenVMS usage:longword_signed
    type:         longword (signed)
    access:       write only
    mechanism:    by reference
    Length of the module header. The buflen argument is the address
    of a longword receiving the length of the returned module header.

 updatedesc

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by descriptor
    Additional information to be stored with the module header.
    The updatedesc argument is the address of a string descriptor
    pointing to additional data that the Librarian stores with
    the module header. If you include this argument, the Librarian
    updates the module header with the additional information.