OutputSidePartner is an IActorPortId interface to the service (or its proxy) that is linked to this output. It returns null, as long as we are not linked (OutputState==WcfState.Unlinked). It is used to return identification data like Uri, AppVersion... (see IActorPortId).
IActorOutput.OutputSidePartner
ActorOutput Class | SourceForge.AsyncWcfLib Namespace