Adobe Acrobat 7 Professional - Manual (Page 7)

Navigating your Help-session history
The Help system maintains a history of your Help session so that you can go back and
forth quickly among the topics you open.
Click the Previous Topic button on the Help toolbar to return to topics you opened
earlier in your Help session. Click the Next Topic button to move forward again.
When you close Help, you end your Help session and delete the history.