Sometimes you have a lot of code, and your screen isn’t tall enough. I found this blog post that shows you how to set up Vim in a sort of “book-mode” where you have two or more panes that scroll synchronously so that you can see two or more pages of code at once.
1GCTRL-W v:set scrollbindCTRL-W lCTRL-F:set scrollbindCTRL-W h