Library /sys$common/syshlp/helplib.hlb  —  LBR Routines, LBR$SET_MODULE, Condition Values Returned
    LBR$_HDRTRUNC      Buffer supplied to hold the module header was
                       too small.
    LBR$_ILLCTL        Specified library control index not valid.
    LBR$_ILLOP         Error. The updatedesc argument was supplied
                       and the library was a Version 1.0 library or
                       the library was opened only for read access.
    LBR$_INVRFA        Specified RFA does not point to a valid module
                       header.
    LBR$_LIBNOTOPN     Specified library not open.
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