Buell S1 Lightning Workshop Manual page 355

Using links
Creators of PDF documents can create hypertext links that connect two parts of
a document. Links can also connect part of a PDF document to another PDF
document or to another application file, such as a spreadsheet or movie.
To use a link:
Click any text or graphics that is identified as a hypertext link. The pointer
changes to a pointing finger when positioned over a link.
To return from a link:
Click Go Back or choose Go Back from the View menu to return to the previous
page view.
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