Can a single UPS be used to shut down two computers? We've got a UPS that has 1 USB and 1 serial connection. I know I can connect 1 computer to the UPS and have the UPS shut down the computer incase of a power failure. My question is if I can connect one computer via the USB, and another computer via the serial connect. If the power fails, both computers will shut down. Each invidual computer will work independently, but i'm not sure if both will work at the same time.