Hi,
Sorry, I don't know anything about that document and the link just takes me to dead end.

Using the comparators in the PIC is like using any comparator except you "connect" the various inputs and outputs to different things (I/O-pin, internal peripherals etc) using bits in a register. What the bits in those registers do is spelled out in the datasheet, what to set the register TO totally depends on what it is you want to do.

This application note from Microchip has a bunch of tips and tricks for using the comparators, perhaps it'll help.

/Henrik.