code: public void init (int invOid, int invCode, InvocationDirector invDir)
      {
          _invOid = invOid;
          _invCode = invCode;
          _invdir = invDir;
      }
docs: Initializes this invocation marshaller instance with the requisite information to allow it
  to operate in the wide world. This is called by the invocation manager when an invocation
  provider is registered and should not be called otherwise.