Split a physical X display into two virtual displays?

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http://unix.stackexchange.com – I just purchased a TripleHead2Go and configured it using OSX. What this box does is simply take 1-3 multiple external monitors and combine their signal into one single resolution. I'm using two external 1920x1080 displays with it, bringing my display size to 3940x1080, alongside my laptop's regular display of 1920x1200. My laptop is running FGLRX 8.95 with Catalyst 12.3, the video card is an AMD Radeon HD 6700M. Here's what I'm looking at, presently: Here is my xorg.conf file: http://pastebin.com/jgm9AwqN Is there a way for me to "split" this massive display into two, virtual 1920x1080 d (HowTos)