Someone's comment in this question led me to realize there's a dual tag.
This tag is pretty silly. It looks like most of the questions are about dual booting, but some of them are about dual monitors.
It seems that in nearly every case someone typed "dual boot" or "dual monitors" and that got separated into dual boot or dual monitors.
Should this tag be about dual booting or dual monitors, and synomized with one of those tags? Or do we really need a tag for things that come in pairs?