okBTPipeIn completion

I am wondering if I can know when a pipeIn transfer has completed. There is no firmware signal to mark a completed transfer.

If I do a transfer to an okBTPipeIn then immediately cause a trigger in an okTriggerIn. Am I guaranteed that the okBTPipeIn will not have any residual data?

The question here may be:
Does the okBTPipeIn have any buffering itself?