/sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  CANCEL  TRACE  Qualifiers  /ALL
    By default, cancels all user-defined tracepoints. When used
    with /PREDEFINED, it cancels all predefined tracepoints but
    no user-defined tracepoints. To cancel all tracepoints, use
    /ALL/USER/PREDEFINED.
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