docs: def _sendTo(self, proto):
          """
          When sent, call the C{startProtocol} method on the virtual transport
          object.
  
          @see: L{vertex.ptcp.PTCP.startProtocol}
  
          @see: L{vertex.q2q.VirtualTransport.startProtocol}
  
          @param proto: the AMP protocol that this is being sent on.
          """
          # XXX This is overriding a private interface
          super(ConnectionStartBox, self)._sendTo(proto)
          self.virtualTransport.startProtocol()