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The polling model requires usage of generated type-specific Poller valuetypes. A valuetype is used because all operations
are locally implemented. The basic generated Poller encapsulates the operations for obtaining replies to an outstanding asynchronous
request. A derived PersistentPoller valuetype also adds private state that allows the response to be obtained from a client
other than the client that made the request. This private state is used by the PersistentPoller implementation in conjunction
with the messaging-aware ORB.