The ActivateSubscriptionMsg sends a message to QCapture asking it to invalidate the send
queue and perform the error action specified in the publication.
The DeactivateSubscriptionMsg sends a message to QCapture asking it to invalidate the send
queue and perform the error action specified in the publication.
The InvalidateSendQueueMsg sends a message to QCapture asking it to invalidate the send
queue and perform the error action specified in the publication.