Wecome to the forum. DW has continued pushing and refining their products in the last 5 years (my span of experience). I do not have hands-on for the full range, but this should help.
http://digitalworkshop.com/products/Inf ... ures.shtml
Most mainstream laptops will have graphics chips that handle two-monitor presentation set-up (check to see if it has a VGA port -- that's a clue). However, more and more the 'vanilla' laptops (ie, middle of the road types and the budget types) may skimp on graphics power and have only 'adequate' display resolution. Cheap graphics processor/chip might share system memory.