Preview

I wasn't sure of this myself until i did a bit of testing...

The Back/Forward buttons are for PDFs with a Table Of Contents. If you have a multi-page PDF with a TOC open it up in Preview. Go to a page towards the middle of the document from the TOC in the Drawer (I'll use page 30 for the heck of it) . Now go to page 4. Click the back button. It should take you back to page 30. Actually, you'll notice that the Back/Forward buttons were inactive until you went to page 30 (at which point the Back button activates, then when you go to page 4 the Forward button activates).

I'm sure you can see how this differs from Page Up/Down.

cheers

edit: heh, funny bug. I opened a 338 page PDF. Obviously, it opens to page one. I clicked on a link in the TOC which took me to page 124. I hit the Back button and it took me to... page 2?! Goofy.
 
Cool, thanks for the explanation. I guess I can see the usefullness of it, but not sure I would use it. Thank goodness for the customizeable toolbars in OS X.
 
Check it out... If you customize the toolbar, there's a little scroll test button...

It's really awesome to see in action. :D
 
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