Have you ever heard of a Peer 2 peer that’s secured by WinXP client Admin?

Hi I have just this last week been asked to look into a small network for the local community centre service in my area – they have no NM – and don’t have info to tell me what’s happened on their NW system in the last few years (or Anything about it)- network is my IT weak point, so I need help to help these people …
So If anyone can tell me about Peer to peer networks using XP Pro and XP Home +’98 would be Greatly appreciated ……….. I suspect that the guy who set it up used Admin rights in XP Pro to set the passwords and accessability of files across the network instead of just doing shared files, but But I’m not sure if that is possible – and I’m not sure if it was done this way

Please Help
Daina