5 and 6; one on each current machine (have 4 loaded on an OS9 boot somewhere but have given up on it). I used 5 for several reasons; to ensure P5 compatibility of what I build, because it creates a slightly simpler cr2 and has a smaller footprint, and because it will run on the old laptop. (Actually, only reason I even HAVE P6 is because P5 is incompatible with OS 10.4) What happens when I add P7 to the mix, I don't yet know.