Used by a Requestor to register an event handler to be notified whenever an event occurs.

Used by a Requestor to register an event handler, as specified using a Control , to be notified whenever an event occurs.

NOTE: Interest is required (through DOFSystem.beginInterest(DOFObjectID, DOFInterestLevel) for this operation in order to determine the primary provider. If no interest is specified, then this operation will result in a DOFErrorException.TIMEOUT exception.

NOTE: If the primary provider changes during the lifetime of this operation, and the Control response level includes exceptions, then see EventOperationListener.eventSignaled(Register, DOFProviderInfo, System.Collections.Generic.IList<E>, DOFException) for what to do.