Library /sys$common/syshlp/helplib.hlb  —  CLOSE  Qualifiers  /LOG
       /LOG (default)
       /NOLOG

    Generates a warning message when you attempt to close a file that
    was not opened by DCL. If you specify the /ERROR qualifier, the
    /LOG qualifier has no effect. If the file has not been opened by
    DCL, the error branch is taken and no message is displayed.
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