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Registration(C->S): Justin
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Login (dependens on resgistration) (C->S): Justin
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Activity Message(C->S) : Peng
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Activity Broadcast(S->S, S->C): Peng
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Server Anounce(S->S): William
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Authentication(S->S): William
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Lock Request(S->S)
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Redirect(S->C, C->S)