Triple Monitor on Windows XP

I have an HP Elitebook 8530W with Windows XP w/ SP3 in a docking station. I would like to use the two LCD monitors hooked up to the docking station AND the laptop monitor as well. Where do I go to add the third monitor (laptop monitor)? The nVidia Control Panel or the Desktop Manager?

I have a Quadro FX 770M.

I went to HP’s website and have the most up-to-date drivers from there and installed drivers from nVidia’s site.