Red_Avatar: Yeah I know the Graphire and Bamboo are heavily simplified versions and lack many advanced features but their pens use the same technology with magnetic fields. That is how it can detect a device too - it's ingenious and very clever but also why the pens cost this much money.
I did not intend to disagree with that, just to note that the Bamboo (whether due to the the pen or tablet, I don't know) lacks the tilt sensitivity, and also only has one type of pen, unlike the Intuos which also has a marker-type and airbrush among others. Correct me on this if I'm wrong, but I believe the tablets know which brand of pen (Intuos/Bamboo) is near and refuses to work with the wrong one.
Mine works well enough with the dual monitor, except that as I said, the tablet is wide. If I don't want the drawing aspect ratio to get distorted (not that it matters too much with how "well" I draw anyway), one screen gets about 80% of the tablet, and the rest gets to the other screen.