|The DB2 MQSeries functions support three messaging models: datagrams, |publish/subscribe (p/s), and request/reply (r/r).
|Messages sent as datagrams are sent to a single destination with no reply |expected. In the p/s model, one or more publishers send a message to a |publication service which distributes the message to one or more |subscribers. Request/reply is similar to datagram, but the sender |expects to receive a response.