The message descriptor structure (MQMD) is an input/output parameter for the MQPUT and MQPUT1 calls. Use it to define the message you are putting on a queue.
If MQPRI_PRIORITY_AS_Q_DEF or MQPER_PERSISTENCE_AS_Q_DEF is specified for the message and the queue is a cluster queue, the values used are those of the queue to which the MQPUT resolves. If that queue is disabled for MQPUT, the call will fail. See WebSphere MQ Queue Manager Clusters for more information.
There is an introduction to the message properties that MQMD describes in WebSphere MQ messages, and there is a description of the structure itself in the WebSphere MQ Application Programming Reference.
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