Virtual PC emulates the hardware of a PC. If you get a bare bones version and have a windows operating system on CD, you can install it through the emulated PC firmware. Rather than going thru this multi-hour process, you can also install Connectix packs available from Connectix Inc. to install OSs much faster and easier. But, Connectix does only use a graphics card emulator-it doesn't use your hardware graphics card but uses software. This means that it doesn't have 3D graphics support or acceleration, but 2D is fine in the software. If you are just running business apps, it should be fine. If you want gaming, most of the new games released for Windows also have Mac OS X counterparts. With the G4 and its great graphics support, it is very fast and have goot frame per second rate, and it is much faster than Windows because of the processor and its graphics integration.