Library /sys$common/syshlp/helplib.hlb  —  LBR Routines, LBR$PUT_HISTORY, Description
    LBR$PUT_HISTORY writes a new update history record. If the
    library already contains the maximum number of history records
    (as specified at creation time by CRE$L_LUHMAX; see LBR$OPEN for
    details), the oldest history record is deleted before the new
    record is added.
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