DII also provides a deferred synchronous invocation. This feature is not part of CORBA 2.0's SII. Deferred synchronous invocations are submitted without having to wait for a response. This is similiar to a one-way operation except a return values and out parameters are possible, but must be polled for. CORBA 3.0 will support this type of invocation for both static and dynamic modes via the Asynchronous Messaging Service.