如果按下相应的停止按钮，会产生一个StateChange通知消息，并且会调用一个Restart动作，将应用程序恢复到运行状态，这一点在前面已经讲到了。

If the corresponding stop button is then pressed a StateChange notification is generated and a Restart action is invoked to get the application back to the running state, as discussed previously.

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