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Wires are used to connect clients directly to a service. Many applications , however, such as event-based systems require support for broadcast-style interactions where clients send messages to a destination that one or more consumers listen on. These loosely coupled interactions are often referred to as pub-sub messaging. Fabric3 supports assembling pub-sub applications through SCA eventingchannels. This chapter provides an overview of how to use Fabric3's eventing facilities.