This is wierd, and is consistant enought that there must be an explanation, but I haven't found it. When I'm typing, no matter what the program (notepad, Word, Excel, even while typing this post), if I type the letters TR fast enough, I get the error beep. At first I thought I was just typing too fast, but that's not it. I can type other combinations must faster, and get no beep. It only happens when both letters are uppercase, and only when I'm pressing the left shift key to get uppercase; it doesn't happen with caps-lock on and doesn't happen using the right shift key. I've played around the keyboard and haven't found any other combinations of keys that do this. Finally, I've been able to replicate this on 4 different machines: a Dell C810 laptop, a Dell D600 laptop, a Dell Optiplex GX260, and Compaq Presario (don't recall the specific model). All were running XP-SP2. Anybody have a theory that might explain this puzzling, but totally trivial phenomenon? Can anyone else produce these results?