A Broker maintains “clients” for publishers and subscribers that have connected to Broker. A client is a queue for documents to which a subscriber has subscribed. When a document is published to the Broker, the Broker places the document on each subscriber’s queue.
Integration Server has a notion of “triggers” which are associated with a Broker client.
IS retrieves documents for its triggers from the corresponding Broker clients (queues), placing the documents in an IS trigger queue. The documents here are waiting to be dispatched by IS to the appropriate “trigger service” which will process the document.
IS uses these trigger queues for efficiency–it’s better to retrieve several documents waiting in the Broker instead of just one at a time. The trigger queue also lets IS manage serial and concurrent trigger service execution.
HTH
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