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                        Documentation question: Lighthouses
Some questions on lighthouses.
- What role does the Lighthouse perform in the network? Is it purely for discovery?
 - Does it "only" know about the hosts that have spoken to it?
 - Do the Lighthouses talk to each other to share the rest of the nodes in the network?
 - If you have two lighthouses (A and B), with nodes (1,2,3) talking to lighthouse A, and nodes (4,5,6) talking to lighthouse B. Can node 1 talk to node 4? Does node 1 need to know about both lighthouse A and B? Does node 4 as well?