Windows explorer split window

Question

Is there a similar addon or tool such as the SplitTab addon for Firefox for windows explorer?

Neither of these questions provides what I need.

SplitTab in the browser:

http://superuser.com/questions/9598/is-there-a-way-to-split-a-single-browsers-window-tab-into-2-viewing-areas

Windows Explorer Replacements:

http://superuser.com/questions/90/what-is-your-favourite-replacement-of-windows-exporer-for-managing-files-and-such

Answer 1

FreeCommander has, by default, a dual folder view.

It can be customized to be a horizontal side-by-side view as well.