在这个示例中，它们仅仅打印跟踪以显示在启动和关闭服务器时确实执行了这段代码。
In this example, they simply print out a trace to show that the code is actually executed during server startup and shutdown.
AppBuilder允许您快速构建应用程序，提供了具有语法突出显示功能、可启动和停止服务器并能访问运行时日志和通过控制台进行跟踪的内置编辑器。
AppBuilder enables you to quickly build applications by providing a built-in editor with syntax highlighting, start and stop the server, and have access to the runtime log and trace via the console.
应用程序服务器应该跟踪在使用的设备上的用户注册信息，以便正确显示数据。
The application server should track the user's sign-in on the device being used in order for data to be presented correctly.
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