Communication via Message-Passing

In message passing, SEND and RECEIVE operations are used to synchronize, and to pass data via a specified communication channel. At one end of the message-passing spectrum, the SEND can refer to the specific process to which the information is sent, and the RECEIVE can refer to the specific process from which the information is received this option is referred to as direct naming. At the other end of the spectrum, the SEND and RECEIVE can refer to global mailboxes. Since the mailbox is not directly tied to a particular process, this method is more general, and provides better support for client / server interaction, where there are multiple clients or servers. 

Communication between one neurone and another or between a neurone and an effector tissue such as muscle is mediated via neurotransmitters. Although the message, for example the sensation of pain, may be passed a long distance, neurotransmitters... 

There was no call from the orthopaedic ward to indicate a need for district nurse visit The visiting nurse did not discuss the case in detail with nursing colleagues, nor with the doctors District nurses had no reliable means of communicating with doctors typically passing messages via reception... 

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