VMS Help LBR Routines, LBR$PUT_RECORD, 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.

 bufdes

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by descriptor
    Record to be written to the library. The bufdes argument is the
    address of a string descriptor pointing to the buffer containing
    the output record. The maximum record size for VAX libraries is
    symbolically defined as LBR$C_MAXRECSIZ; for Alpha libraries, the
    symbolic maximum record size is ELBR$_MAXRECSIZ.

 txtrfa

    OpenVMS usage:vector_longword_unsigned
    type:         longword (unsigned)
    access:       write only
    mechanism:    by reference
    Record's file address (RFA) of the module header. The txtrfa
    argument is the address of a 2-longword array receiving the
    RFA of the newly created module header upon the first call to
    LBR$PUT_RECORD.