Message Communication Modes
Messages can use two different communication modes: synchronous and asynchronous. A synchronous communication mode is one where the sender of a message has to wait for a response before proceeding. For example, when you swipe a credit card for completing a transaction, the machine will dial the authorizing computer and has to wait until it receives an “approved” or “rejected” message. Note that synchronous messaging requires that both parties are active in order to complete the message transaction. With asynchronous communication, the sender of a request doesn't need to wait for a response and goes on about its business without any confirmation of the receipt of the message. E-mail messages are good examples of asynchronous ...
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