Use AppServer to communicate with the providers that supply data to and resolve updates for the XML broker. If the providers are on a remote application server, AppServer has the same value as the AppServer property of the connection component. If the XML broker uses a provider in the same process space, AppServer is the interface to an internally created object that dispatches IAppServer calls to the local provider. 

Applications don't need to work directly with the IAppServer interface. The properties and methods of the XML broker are automatically translated into IAppServer calls as needed. 

HasAppServer 

AppServer 

SetProvider