A.L.A.R.M. is A Laptop A/C Removal Monitor for Windows XP and later. If your workstation is locked and A/C power is being removed, it loudly plays a warning signal for theft protection. Slim, sound file can be specified.
Working in a public library or similar and need to leave your laptop / tablet? THIS is exactly what's needed. Works on Windows Surface Pro with latest 64 bit OS as at 8/1/2015. Can arm all the time or only if screen is locked. Will not set off alarm if AC power is not connected and screen is locked, only if it's connected when locked and then removed. Replacing the AC power turns it off even when the screen is still locked. Brilliant. Should be built into the OS. Thanks a bunch to the dev. Cheers.