Hi Tuicemen,
I am finding at these forums a wealth of knowledge and a wealth of generosity. Right on! To you, and to everyone else who helps and has helped us newcomers (I especially mention Puck for helping me several times, and I've only been here for about a day), thanks!
I don't know the full details of what I want to do yet, since my first order has only just been shipped, but I anticipate using the remarkable program BlueIris, a multiple webcam alert program, and integrating it a little with X10. When it detects motion in front of up to (I think) 12 webcams, it can send time/date stamped and watermarked clips by ftp and images by e-mail and stream to a webpage, phone you, and run a Windows command (I forget what else). I thought I might have it run a command, or set of commands, using the X10 system that would flash lights and run the powerhorn siren for 20 seconds, or something else along these lines. Eventually, if I had a powerhorn or two by each webcam, I suppose could have the system chase a burglar around the house and make each sensitive area intollerable. X10 should do something like this and advertise it: "X10 fights back! Have your X10 chase burglars around the house for you, and drive them out PRONTO!" (Ha ha.) When I figure out in more detail what I'm after, I'll head over to the SDK forum.
Thanks again!