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Protocols have uses in inter-process communications, they allow processes to cooperate and to perform tasks as a group.

Protocols consist of:

- Ordering of messages to be exchanged,
- Message formats,
- Acions taken on the transmission and/or receipt of a message or other event.

Ordered messages with precised data formats are similar to method calls, parametrized or not.

Protocols can be modelled as a Tree, with message leading from one processes state to another, depending on data passed. Process state change can result in sending more of messages - to one or more of processes. Or messages can be sent periodically, their type, timing, amount & targets depending on state.

Source: [3], [13].

See also if You wish or need ... : Conversation State.

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