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.
在这一点上，皮特想要点击internet explorer的图标其中部分被另一个窗口覆盖。
At one point, Pete wanted to click on the Internet Explorer icon on the desktop, which was partially covered by another window.
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