Library /sys$common/syshlp/helplib.hlb  —  LBR Routines, LBR$SET_INDEX, Condition Values Returned
    LBR$_ILLCTL        Specified library control index not valid.
    LBR$_ILLIDXNUM     Library index number specified not valid.
    LBR$_LIBNOTOPN     Specified library not open.
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