Out of impatience (and maybe frustration), I podmaster, held down the keys DJK simultaneously on my Microsoft Natural Keyboard whilst running Win2000 and was confronted with a BEEP every half a second or so (probably less) and lasting about as much.
Most other key combinations didn't do any beeping.
Through further testing with the help of fellow monks (and [katgirl] -- DellPC), I have come to find that I am not alone.
[PixelRat] chimed in with "my computer actually reboots when i press ctrl, alt + delete (and it beeps!)"
[dada] asked if it was the same beep as produced by print chr(7) -- bell
It was not. The bell is high pitch and long, while this one is low pitch and short.
Here is a list of keys which have beeped
D J K
C N K
E T K
D F K
E R I
R T I
**all'em people in brackets are perlmonks