Yes, but you can plug monitors, a keyboard and mouse into a laptop just as well.
" Two displays: 2560p, 2760p, 8460p, 8560p. Three displays using integrated Intel graphics: 2170p, 2570p, 8470p, 8570p. Five displays using AMD Eyefinity Technology: 8460p, 8470p, 8560p, 8570p. "
That's without a dock. All do have docking stations available.
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.js...