MD I架构允许子框架窗口重叠，无论如何，在同一时刻只能有一个子框架是活动的。
The true MDI framework allows the child frame Windows to be overlapped, anyway only one child frame is active at any time.
浏览实例由所有互相关联的窗口、框架和子框架构成，而网站实例由所有来自同一网站的网页构成，并存在于浏览实例中。
A browsing instance is made up of all interconnected Windows, frames and sub-frames, while a site instance is a collection of pages coming from the same site and existing within a browsing instance.
注意底部的状态栏是它自己的子窗口的框架窗口和不滚动，当你使用滚动条在编辑子窗口。
Note how the status bar at the bottom is its own child window of the frame window and doesn't get scrolled when you use the scroll bars in the edit child window.
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