def sendToReplica(self, msg, frm):
        """
        Send the message to the intended replica.

        :param msg: the message to send
        :param frm: the name of the node which sent this `msg`
        """
        # TODO: discard or stash messages here instead of doing
        # this in msgHas* methods!!!
        if self.msgHasAcceptableInstId(msg, frm):
            self.replicas.pass_message((msg, frm), msg.instId)