How to rotate the screen in Windows XP

Classify this one under useless tricks and pranks... well I can see an actual use for it... but still I find difficult reason for this to be so easy to do. Probably makes alot of sense with Tablet PC's.

In Excel, I can never remember the key sequence (Ctl-Shift-DownArrow) that selects the current column all the way down to the last entry. It's a time saver, and it would save even more time if I could remember the sequence of keys that does it. I always have to hunt around trying various key sequences until I find it.

Today's sequence of wrong guesses included Ctl-Alt-DownArrow. Whoa! Not what I expected. When did they put that in?

Before you give it a try, reemmber that Ctl-Alt-Up arrow "puts it back," and Ctl-Alt-Left and Ctl-Alt-Right do the other permutations. I did not know about this key sequence. I guess it's in XP so you can mount your display in different orientations.

hint: This causes the screen to rotate its orientation, putting the tool bar on the Top, bottom, or side of the monitor... with the whole time, the tool bar is at the bottom. If you want to move your tool bar, just drag it to the top.

Update: - Apparently this is a video driver feature, not OS. Mostlikely Nvidia.