这些按钮可用作一个信号，以便用户能够触发一个活动或业务流程。
These buttons can be used as a signal so that a user can trigger an activity or business process.
两个信号处理器被连接起来——一个用来在用户关闭窗口时退出应用程序，另一个用来在用户点击按钮时，修改显示的欢迎信息。
Two signal handlers are connected — one to quit the application when the user closes the window and another to change the greeting that is displayed when the user clicks the button.
这个简单的设备包含了一个压力感知按钮，当我们按下或者释放该按钮时它会发送一个信号。
It's a simple device that contains a pressure-sensitive button that sends a signal when it is pressed or released.
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