HouseHead

OK I have a gateway M-Series laptop that clearly can connect to another monitor through the back. I hooked up an extra monitor. What I would like to know how to do now is..

The Monitor to my left, I just bought, an LG 22" widebscreen and I would like to make the laptop just area I drag stuff onto and use it to multi-task with my other, Anyone get what I am saying and might know how to point me in the right direction...