我们将会看到一些代码样本，它们阐述了如何使用页面导航特征来执行在门户环境中转换的多个Struts模块。

We will look at code samples that illustrate how to perform multiple Struts module switching in a portal environment using the page navigation feature.

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屏幕上的每一个元素并没有直接或明显的结构性特征，都有可能被误解为导航控制。

Every element on the screen that has no direct semantic or obvious structural character can be misunderstood as a navigational control.

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注意两个重要特征：清楚的导航和新闻。

Note two important features: clear navigation and news.

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