Laptop with Docking Station

Where can I get information on how to set up 9.2 in a laptop which I will be using alone a good part of the time, and sometimes, using a docking station with a larger monitor? Specifically, how do I set up the second monitor? Sax seems to limit me to one. I can't use "multi-head" because I have only one video card.This will be "either or" not "both" dj tuchler