the registry is a neat little file that is hidden by windows, is written very crypticly, and controls a lot of stuff.
take a look at the windows registry....type "regedit" in the run box.
to see it on a PPC, you need a 3rd party editor...windows CE doesnt have one. you have to be careful what you change in it, as some things are tivial, and others are critical to your system and changing them is disaster unless you know what youre doing.