Generic PRM help - already read documentation

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Hi There, i'm been fiddling with the PRM for about 3 days now, i'm definately missing something and I could use some plain english 

Maybe someone would be able to elaborate a bit on how the PRM works, because i'm really lost. Is the PRM totally seperate from salesforce (aside from sharing a database, and fields)

I can't login to the PRM link with my admin account, that is of course I make my admin user a "partner user", but I can't just change my user, I have to make a new user that is a "partner user".. is that right?

It just seems a bit silly to have to make a different user just for the PRM, I mean, I would like to share my email address.  Maybe i'm just doing it wrong/have the wrong concept?  Would anyone be willing to straighten me out a bit?

Thanks in Advance 

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Nobody knows the answer?  

I just want to know if there's a way you can be a "Partner user" and a "salesforce user" so people can admin partner accounts.?