VMS Help DCE_IDL, DCL Command Interface, QUALIFIERS, /TRACE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

      /TRACE [=(option[,...)]
      /NOTRACE

        Specify one or more of the following options:

        [NO]LOG_MANAGER
        EVENTS=({ALL|CALLS|CONTEXT_HANDLES|ERRORS|NONE|MISCELLANEOUS}[,...])
        /NOTRACE (default)

        This qualifier is equivalent to the -trace value argument in the
        universal syntax, which is documented in the Compaq DCE Product
        Guide.