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Ultra-Peers
From iA wiki
An attempt to reduce the network overhead caused by the initial version of the Gnutella protocol in the form of server-class machines, which deal with network routing. These machines usually have to maintain a great deal of client connections (called leafs) and inter-ultrapeers connections to the rest of gnutella (called peers).
FastTrack has a similar technology called Superpeer or Supernode.
