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

       /SILENT
       /NOSILENT (default)

    Controls whether the "trace . . . " message and the source line
    for the current location are displayed at the tracepoint. The
    /NOSILENT qualifier specifies that the message is displayed. The
    /SILENT qualifier specifies that the message and source line are
    not displayed. The /SILENT qualifier overrides /SOURCE.