-The mechanism that buffers messages (a.k.a. queue)
may have the following properties
- zero capacity-queue has lenght 0, no messages can be out standing on link, sender blocks for message exchange.
- bounded capacity-queue has length N, N message can be in queue at any point in time, sender blocks if queue at any point in tme, sender blocks if queue is full, otherwise it may continue to execute.
- unbounded capacity- queue has infinite length, sender never blocks
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