Using WinXP Pro (obviously, to the super techs), I'm trying to work out what permissions I should use to create a similar effect that admin shares have.

Okay, that sounds weird so I'll try and break it down into something understandable; when I try to access an admin share, ie: c$, windows prompts me for a login username and password. However, folders I've created that are very limited in permissions don't prompt me for any login. I know I can give alternative credentials if I map a drive, but surely there's an easier way? I'd rather not have to map half a dozen folders. Too many drive letters kicking about that way

Have you disabled simple file sharing?