how to get Opera and IE to think i'm on a desktop pc

[JDub0820]

Maybe a dumb question but here goes..is there any way to do this by a registry edit? If so, then would it not be possible for someone (not me cause I am clueless) to create two cab files with the edits, one to switch to allow for full web page view and another to switch back in order to allow the Sprint powerdeck site to recognize the device, thus allowing to check for updates? I do like the full pages but I would also like the ability to check for updates, so I thought I would ask.