Here ya go, been using this snippet of code for as long as I remember. This switches Right and Left in the lower corners respectively. I never liked switching by hitting the whole edge of the screen it can get annoying, so the 1 pixel hotspot in each corner has always been the best solution for me.

I love watching people use my computer and hit those spots by accident, they usually can't figure out were their windows went. :)

Curious how this would work on a dual monitor. ;)