Hey TP,
As I understand it, G12 and 13 are basically for cutting an O-ring groove (or snap ring).. one pass w/a woodruff key cutter for example.
The I will enter with X, the J with Y. This works well, I've used it a few times.
Adding the Q and P allows you to mill a quick counterbore or a spotface around an existing bore.
I don't think it's intended to be a full pocketing canned cycle, just an embellished grooving cycle.
Comes in handy, just position the X,Y and Z to the desired pos. before running it.
Thanks,
Russ