The following threads may/may not give you an insight: http://www.gnutellaforums.com/showth...threadid=25129

http://www.gnutellaforums.com/showth...threadid=23701

http://www.gnutellaforums.com/showth...threadid=26737

Nd these are at least semi-related: http://www.gnutellaforums.com/showth...threadid=25246

http://www.gnutellaforums.com/showth...threadid=25891

Actually there's similar topics discussed in each section of the forum, each with their own unique answers. It ends up becoming a very broad topic. It depends how far/deep you wish to delve.

My apologies I didn't realise how old this thread was, I don't quite know why it was sitting at/near the top of the list.