I was looking at the APC BACK-UPS 1500KVA which ocUK sell.
So, would this work:
1. Plug the USB cable into the XP box, and tell the software to shut the box down on a power cut.
2. If there's no cable into the back of the BSD box, is there some kind of deamon which can check that the UPS is shutting down? I'm not sure how that would detect if the UPS is going down if there is no monitoring...