def get_agency_admin_session(self):
raise Unimplemented()<EOL>
Gets the ``OsidSession`` associated with the agency administration service.

        return: (osid.authentication.AgencyAdminSession) - an
                ``AgencyAdminSession``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_agency_admin()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_agency_admin()`` is ``true``.*