The PIXUpdateNotification project defines a message driven bean (MDB) to handle PIX update notification events. These events occur when changes are made application server. This MDB waits for the JMS topic to receive messages. Messages in the topic trigger the PIX update notification bean, which then checks the message to determine which domain caused the update and looks up the domains that are subscribed to updates from that domain. It generates all the necessary JMS messages and queues them on a V2 or V3 topic.