From Hamachi's site:
Quote:
Hamachi is a UDP-based virtual private networking system. Its peers are helped by a third node called a mediation server to locate each other and to bootstrap the connection between them. The connection itself is direct and, once established, no traffic flows through our servers.
Hamachi is not just truly peer-to-peer; it is verifiably secure peer-to-peer.
Hamachi is able to successfully mediate p2p connections in roughly 95% of all cases. This includes peers residing behind various firewalls or broadband routers (aka NAT devices).
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So it needs the node initially to figure out where everyone is, but once established, I assume, it figures out the optimal way to send data across.