Quote - "You need to have a video card with enough capacity to drive two monitors." 

Back in the olden times, we used two video cards. Living in the hardware museum, I didn't even know dual heads were the standard now, sigh.  

You can get cards with six outputs. You can get external devices that'll take a single input and split it out across three... Lots of screen estate...

Poser 7 over four screens a couple of years back - just trying as an experiment...

My next build is going to take advantage of one of those 6 output ATI Eyefinity cards and add an additional three 24"... and then I take over the world! ;)