VMS Help CLOSE, Qualifiers, /LOG  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /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.