Latest news is, that UDP will not be used for searches despite LimeWires prior announcements and their efforts to implement GUESS. The latest development ultrapeers have 42 intra-ultrapeer connections, TTL is reduced to 4 and query-requests will be sent to one of the ultrapeer connections at a time so LimeWire will be able to stop the query once it has a certain number of results. GUESS won't allow such an extensive use of QRP as this scheme does and searching 50,000 ultrapeers with GUESS would be a pain while it isn't a problem for a TCP searches.