Library /sys$common/syshlp/scacp$help.hlb SHOW, TRACE, Qualifiers, /OUTPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /OUTPUT[=filename]

    Creates the specified file and directs output to it. If the
    filename extension is .DMP, the trace data is written to a
    dump file so that you can use the /INPUT qualifier to display
    it later.