Adobe Acrobat 7 Professional - Manual (Page 218)

Creating buttons
Buttons are most commonly associated with forms, but you can add them to any
document. Buttons can open a file, play a sound or movie clip, submit data to a web
server, and much more. When deciding on how to initiate an action, remember that
buttons offer the following capabilities that links and bookmarks do not:
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A button can activate a series of actions, not just a single action.
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A button can have alternate appearances, determined by mouse behavior when over the
button.
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A button can be easily copied across many pages.
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Mouse actions can activate different button actions. For example, Mouse Down (a click),
Mouse Up (releasing after a click), Mouse Enter (moving the pointer over the button), and
Mouse Exit (moving the pointer away from the button) can all start a different action for
the same button.
Related Subtopics:
Creating interactive buttons
Customizing button displays
Showing and hiding image buttons