this method makes a additional check: if the POA has the RETAIN
policy and _servantManager is not a instance of
ServantActivator or if the POA has the NON_RETAIN policy and
_servantManager is not a instance of ServantLocator this method
raises also the WrongPolicy Exception (not spec.)
sets the discriminator to a value that is consistent with the
value of the default case of a union; it sets the current
position to zero and causes component_count to return 2.
sets the discriminator to a value that does not correspond to
any of the union's case labels; it sets the current position
to zero and causes component_count to return 1.
The plugged-in transport (e.g. the Listener instance) shall call
this function when it owns a server-side Connection and data arrives
on the local endpoint.
A boolean flag describing whether this connection supports the
Bidirectional GIOP mechanism as described by GIOP-1.2 in CORBA 2.3.1
(OMG Document: formal/99-10-07).