'Serialize and send this box to an Amp instance.  By the time it is being
sent, several keys are required.  I must have exactly ONE of::
_ask
_answer
_error
If the \'_ask\' key is set, then the \'_command\' key must also be
set.
@param proto: an AMP instance.'

def _sendTo(self, proto):

    proto.sendBox(self)
