[adtac]

How would scrolling work? If both panes went up or down a little, I'd find it a little jarring. Maybe I would get used to it, I don't know.

[TheCoelacanth]

Same as if you have two windows open: whichever one you have the cursor over scrolls.

[alok-g]

Do we really need scrolling? Won't book-like page flips just be sufficient? :-)