Library /sys$common/syshlp/helplib.hlb
SET, HOST, /DUP, Qualifiers, /LOG
 *Conan The Librarian 

       /LOG[=filespec]
       /NOLOG (default)

    Controls whether a log file of the entire session is kept. If you
    use the /LOG qualifier without the file specification, the log
    information is stored in the file HSCPAD.LOG.
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