其高亮度，闪烁的红色痛苦轻，也是推动激活的信号按钮，并直接帮助的，您的位置。
Its bright, flashing red distress light is also push-button activated to signal for, and direct help to, your location.
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.
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