Cancels a previous request or subscription for asynchronous topic updates associated with each CorrelationID in correlators. Upon return, no further message will be generated for those requests or subscriptions.

For asynchronous sessions, a handler may still be processing an existing message for the associated request or subscription after the call returns. While iterating over an event, if any message is encountered for a cancelled CorrelationID, it will be silently ignored, but if the message was iterated to just prior to the completion of the cancel request it will be delivered, it is up to the application developer to handle this condition.

If any of the specified CorrelationIds do not refer to an "active" request or Subscription then, that particular CorrelationID will be ignored.

Once this call returns, the specified CorrelationID can be reused for new requests to this session. Also note that application developers should generally be cautious not to reuse a CorrelationID until all existing references within their applications have been cleared. Depending on the use of the CorrelationID, this can possibly result in accessing application resources which are no longer available.