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Complete CL: The Definitive Control Language Programming Guide, Fourth Edition by Ron Hawkins, Doug Pence, Ted Holt, Kevin Forsythe, Ernie Malaga

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Chapter 6. Message Management

The i5 is a message-based machine. Because messages seem to be everywhere, controlling practically all aspects of the i5, the omnipresence of messages makes it important to understand what they are and how to manage them.

What is a Message?

A message is a free-format communication between two entities. These entities can be two users, two programs, or one user and one program. More often than not, the purpose of the communication is to call attention to a possible problem or to report a special condition such as “Job completed normally.”

Messages are always spoken of as being sent somewhere. The entity at the other end is said to receive the message. Messages can be predefined (as message descriptions in message files) ...

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