Every message in the system has a unique identifier. This identifier is unique within the context of the session that created it, but may not be globally unique. For message that need to be unique across clients, the session id of the originating session should be included in the message.
Wonderland messages are by default serialized and sent to clients. Messages that are very frequent should be hand-packed using the Externalizable interface. @see java.io.Externalizable @author jkaplan
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