Messaging Gateway architecture is represented by four elements connected with arrows. At the upper left is Messaging Gateway Administration PL/SQL Interface, with an arrow pointing to an Oracle Database at lower left. The database contains AQ Queues. The database is connected by a double-headed arrow to Messaging Gateway Agent, which contains the Propagation Engine and three drivers. Each driver is connected by a double-headed arrow labeled Messaging System Link to one of three databases at lower right. MQ Base Java Driver is connected to MQSeries, MQ JMS Driver is connected to another MQSeries, and TIB/Rendezvous Driver is connected to TIB/Rendezvous.