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

    Sets the trace context back to the default settings, which are:

           trace all channels and VCs
           /AFTER=0
           /EVENT=default settings
           /STOP
           /SIZE=512