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In this context, the party which initiates the protocol is considered the client. Interactive means that the client may need to recieve information from the server, so the protocol can be used off-line.
public abstract boolean completed()
public abstract byte[] message(byte received[]) throws ProtocolException
received
is the last message received form the server
and has not yet been sent to the client.
The returned value is the next message to send to the server or null if no more messages need to be sent and the protocol is terminated.
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