用来切换应用程序状态的一个具体控件。
A concrete control that may be used to toggle an application state.
一组选择按钮可用来同时互斥地切换应用程序状态。
A group of option buttons may be used to toggle mutually exclusive application states.
任务栏状态区域，通常称为系统托盘区，它和任务栏是用户切换应用程序的重要区域。
Taskbars status area, usually called system tray, together with taskbar, is an important area for users to switch application.
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