/sys$common/syshlp/DTEHELP.HLB
SET, DTE, /LOG
 *Conan The Librarian 

       /LOG[=filespec]
       /NOLOG (default)

    Controls whether a log file of the session is kept.  By default,
    logging is disabled.

    If you use the /LOG qualifier and omit the file specification,
    then the log information is written to the default log file,
    DTEPAD.LOG.
  Close     Help