JXTA CMS P2P Questions

I'm currently in the process of working on my master's project which 
involves a cms and p2p sharing.

I'm trying to use JXTA for the p2p file sharing. From what I can tell, 
the CMS project primarily allows a person to publish data about a 
document and doesn't abstract away the actual sharing of the document 
itself. Is there anything that does that as well? Or am I best off 
looking through the source code for MyJXTA and going on from there?

Also, I'd like to limit the peergroup able to share files to people with 
an appropriate username/password combination. From what I can tell, the 
standard way to do it is a membership service. Is there an api for that? 
Or do you mostly roll your own (which is what it looks like to me)?

-- 
Jim Zoetewey

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Jim's Blog: http://jim.puddingbowl.org