developing a gnutella client!!!

hello everybody.....this my first messege via this channel and I hope u can help me....

I'm a student that I have a graduation project which is related to the field of developing a gnutella client just like the ones we already have......I was wondering if u can help in finding some papers or sites that can help me understand the way those clients operate in the network level, regarding the protocols that they use between each other......esp. how those network layers communicate and operate.........I would be gratful if u help me with this......thkx in advance