Buell S1 Lightning Workshop Manual page 357

Reading an article
Creators of PDF documents can define document articles that automatically
guide readers through sections of a document.
To read an article:
Select Articles from the View menu (the menu item is dimmed if no articles
exist in the document). The Articles dialog box appears.
Select the article you want to read from the title list and click View to go directly
to the beginning of the article, or click the beginning of the article with the hand
tool. Place the hand tool cursor on any box in the article.
If you start at the first article box, the cursor changes to Read Article, and
the status bar shows Read Article.
Click or press Enter to follow the article.
To return to the previous view of the article:
Hold down the Shift key and click.
To return to the beginning of the article:
Hold down Option/Ctrl and click.
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