Anyone know how to use/enable vtrace?

Hi,
I noticed that there are TRACE_N calls throughout some of the drivers, and found these defined in vtrace.h. I would like to be able to use this facility to watch what is happening. There does not appear to be a vtrace application or man page on my machine to work out how to get access to this output or interpret it - anyone have any ideas where to get this?
Thanks in advance,
S.

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