如果它尚未处于监听状态，那么您可以点击daemon图标来开始监听调试引擎连接。
If it is not already in listening state, click on the daemon icon to start listening for debug engine connections.
程序的最后一行调用mainloop语句，这个语句的作用是开始监听用户事件，并且把它们分派给合适的回调。所有的事件都已被对应的能够产生事件的部件注册。
The last line calls MainLoop, which starts listening for user events and dispatches them to the appropriate callbacks, which have been registered with each widget that can generate events.
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