Send a request, return the reply.  See Send() and Recieve()
        docstrings for details.

def RPC(self, url, opname, obj, replytype=None, **kw):
        '''Send a request, return the reply.  See Send() and Recieve()
        docstrings for details.
        '''
        self.Send(url, opname, obj, **kw)
        return self.Receive(replytype, **kw)