要启动一个活动，在框架的下半部分单击该活动的图标。
To start an activity, click that activity's icon in the lower part of the frame.
请注意框架左上角的四个圆圈状的 “缩放” 图标：最后一个代表最近访问过的活动。
Notice the four circle "zoom" icons at the top left of the frame: The last represents the most recently accessed activities.
围绕Portlet内容创建窗口框架的门户框架常常提供额外的图标来支持更改Portlet模式或窗口状态。
A portal framework that creates a window frame around the portlet content often provides additional ICONS to support changes of portlet modes or window states.
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