Here's something that's not mentioned in LightPhoenix's docs:
F0 x1 y1 CD x2 y2 FF CD x3 y3 FF
The F0 event script displays message y1x1 as well as a Yes/No choice window. If "Yes" is selected, the first CD is called (CD x2 y2 calls the event subroutine at index y2x2); if "No" is selected, it branches four bytes to the second CD, and in either case that's the end of the event script because of the FF immediately after the subroutine.
