Two windows, one buffer

I mentioned in the last section that :split and :vsplit accept a filename. But it turns out that this filename is actually optional!

If you don’t specify a filename and just run :split/:vsplit, you’ll split the current window into two — leaving you with a new window that’s peering into the same buffer!

Interesting! You can have multiple windows that are “looking at” the same buffer. This can be really useful: in a large file, you can keep two far-away sections visible on-screen at the same time.

Try it in the editor! Use the :split or :vsplit commands on their own to create a bunch of windows all peering into the demo buffer. Then, try making an edit to the buffer. You’ll see that your change is reflected in all of the windows.