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Please, go to Microchip forum. Maybe you could find a thread about it.
I now recall trying to use it during debugging without success (18F family micro). It worked with the Simulator that I used just for a bunch of delay routines. I then returned to debugging on the hardware.
Never tried again.
When I first tried it (ver 5.25) I was surprised that I had to set two breakpoints for it to work.