Found the window manager splitwm[1].
Interesting idea. We then found out this can be done using a fake
Xinerama library[2], so you can use any window manager you like. Neat!
If I still had a widescreen monitor, I'd surely give these tools a
try.
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1.
https://bbs.archlinux.org/viewtopic.php?id=157080
2.
http://home.kde.org/~seli/fakexinerama/
