The portability package contains interfaces and classes
that are designed for and intended to be used by ORB
implementor. It exposes the publicly defined APIs that
are used to connect stubs and skeletons to the ORB.
The Delegate interface provides the ORB vendor specific
implementation of PortableServer::Servant.
Conformant to spec CORBA V2.3.1, ptc/00-01-08.pdf