/sys$common/syshlp/helplib.hlb RUNOFF, /CONTENTS, Qualifiers, /LOG  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /LOG
       /NOLOG (default)

    Controls whether the DSR Table of Contents utility displays
    the name of each input file as it is processed and after it
    is processed. The name of each output file created may also be
    displayed. If there are any errors in processing, the DSR Table
    of Contents utility sends messages to the terminal even if the
    /NOLOG qualifier is in effect.