Interact With The Alternate File
If you have a couple buffers going in a Vim session and you check out the buffer list with :ls, you'll notice that one of those buffers has a # indicator next to it. That means the file for this buffer is considered the alternate file of the current, visible buffer. In addition to hitting CTRL-^ to switch to that buffer, you can reference it in other commands with #. This means you can quickly :edit, :split, :vsplit, and so forth the alternate file by just giving # as the argument to those commands.
Quickly open the alternate file in a vertical split with:
See :h alternate-file for more details.
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