>>With the right video card, you can do a similar trick setting up a virtual desktop; ATI and Diamond both have drivers that will allow you to define a video desktop larger than you can comfortably display on your monitor; as an example, you could easily set up a virtual desktop at 1600x1200, display it at 800x600 and scroll the desktop to get to things like property sheets while still being able to see your 800x600 form unobstructed. A 4MB video card can easily support a virtual desktop of 1280x1024 at 16-bit color depth; with an 8MB card, a virtual desktop of 1600x1280 at TrueColor depth is possible.
>
>Is the scroll activated by the move of the mouse past the screen boundaries or with scrollbars?
>

The ones I've used (the ATI Virtual Desktop and Diamond InControl Tools) work by moving the mouse out of the screen boundaries, or by changing focus to a control or Window outside the currently visible Desktop. The Diamond implementation is better IMO. Matrox also has drivers with this capability, but I've never used it there.