Library /sys$common/syshlp/helplib.hlb  —  CRTL  Feature Logical Names, DECC$FILE_SHARING
    With DECC$FILE_SHARING enabled, all files are opened with full
    sharing enabled (FAB$M_DEL | FAB$M_GET | FAB$M_PUT | FAB$M_UPD).
    This is set as a logical OR with any sharing mode specified by
    the caller.
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