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

       /LOG
       /NOLOG

    Requires OPER (operator) privilege.

    Closes the current operator's log file and opens a new one if
    OPCOM is running. The /NOLOG qualifier closes the current log
    file, but does not open a new log file. The current terminal must
    be enabled as an operator terminal. The operator can then examine
    the contents of the previous log file.