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介绍了消息通信机制一消息、消息队列及它们之间的相互关系，重点探讨了在控制语言程序中消息的处理，分析了对于查询消息如何控制其响应，使作业或程序能在不同条件下正常运行。
This paper introduces a mechanism of message and message mechanism, message queuing and interrelationship between them. It focuses on the processing of messages in control language programs and analyzes how to control responses of query messages so that jobs or programs can be normal under different conditions run.