Turning video signal on/off

[Andrew Allen]

I want to programmatically turn off the video signal so my display will power down into standby. I'd like to selectively turn off each video signal on a dual-channel VGA. I did this years ago by tweaking a VGA register under DOS. Now I'm looking for a Windows API to do it. Any suggestions? Examples? Alternatively, I've heard there's a VESA standard to send device control info via the VGA port? TIA