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4.6.2. System specific APIs Many systems provide their own programmatic API for which to interact with the messaging system. The advantage of this it allows the full set of system functionality to be exposed to the client application. API's like JMS are not normally rich enough to expose all the extra features that most messaging systems provide. HornetQ provides its own core client API for clients to use if they wish to have access to functionality over and above that accessible via the JMS API.