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Using pages, you can build a user interface out of nested boxes.
A page is invoked in a similar manner to an action. However, when it is invoked, it covers the whole screen. The code for a page creates boxes and fills them with content (text, pictures, controls). This code is reexecuted automatically whenever content changes, and redraws the entire page. You can set various layout attributes to control the appearance of the boxes and their content.