An MQA message queue file registers the messages in a queue from UAPs. The queue manager (TP1/Message Queue for OpenTP1) sends each message to the appropriate destination. Desired messages can be retrieved regardless of the registration order by the MQA service definition and the specification of MQI.

For the MQA message queue file configuration, types of queues, and operation procedures, see the OpenTP1 TP1/Message Queue User's Guide.