Comment 4 for bug 434476

What you are testing is explained in the doc. The same call with ES_CONTINUOUS = 0x80000000 would not require the call to be made repeatedly (although it would potentially face the same problems as the reg key in the link I referenced earlier).

The real question is whether the screen saver comes on after the call or if this only effects the screen on/off state. I am about to test, but I am stuck on a PC where the screen saver is locked at 15 min so it will take a little longer than it should. If anyone can test in less time, feel free.