Tom J
FWIW
I have used a version of Dave X10's idea since 1993 and it works well to let me know which motion sensor has triggered and to get the attention of whomever set it off( if it was a "whom-ever" and not a "what-ever").
If you you use CM15A, AHP, and BVC you can have your system verbally announce the motion sensor that was triggered, and using X10 appliance modules to selectively power wireless speakers, you can "steer" the announcement to the home's interior room you are in AND to a speaker near the triggered motion sensors location. Whether an innocent visitor or a prowler, or a raccoon, you have their undivided attention when a voice comes out of the blue and says something like (as my system) " This is the voice of Home Control...I have detected movement at the (insert: 'front', 'side', ' back', etc. here) of the house.... I will monitor". A combination of lines from my two favorite old sci-fi movies: "The Forbidden Planet" and "Colossus: The Forbin Project". If you can find wireless speakers cheap (surplus) it is not expensive to do.