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As TCP has no real broadcast functionality to speak of, communication of who is in the network is achieved by each server having a physical connection to each other server in the network.
To join the network, the server must be configured to know the address of at least one server in the network and connect to it. When it does both servers will exchange the full list of all the other servers each knows about. Each server will then connect to any new servers they've just learned about and repeat the processes with those new servers. The end result is that everyone has a direct connection to everyone 100% of the time, hence the made-up term "multipoint" to describe this situation of each server having multiple point-to-point connections which create a fully connected graph.
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