I can see how that would be useful, but I have a question. If you do edits in both windows, how do you save them? Do you just save in one window and reload the other?

In vim, when you have the same file open in different windows any changes immediately appear in the other window. They are the same buffer, there are just two windows to it.

You can see this by opening a file, and hitting "<Ctrl-W> <Ctrl-S>" to split the window. Do some editing and you'll see it in both places. ":ls" will show only one buffer. And if you have display of the buffer state visible, when you ":w" all the windows will update to say they were saved.

Wow, I did not know that. I've always just assumed they'd be different buffers. I'll probably be using this a lot in future. Thanks!