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the last opened. Close all opened listening sockets. Also, the last opened datagram socket would be used to send all datagram messages instead of the one datagrams were received on. It now goes through the same channel where datagrams were last received. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6156 542714f4-19e9-0310-aa3c-eee0fc999fb1