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2.4. Message
Applications produce information that is of interest to other applications. To share that information, they can create a portable unit that wraps the information and makes it transportable - a message.
A message consists of a message content - information of interest to a message receiving application; and message headers, information about the message itself, such as where it should be routed, how it should be treated while in transit, and what has happened to it during its transmission.

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