Battlefield 1942 on a laptop using a 2nd moniter

[Kitlope]

Hello everyone. I have a Toshiba m40-YP3 laptop thats almost a couple years old and it runs BF42 just fine, with a 1.86 Centrino, nVidia Go! 6600 mobile GPU, 2 GB of PC 2700 ram and a 15.4 " screen. The question I need help answering though is it has a VGA input for a second moniter and I want to hook up this BenQ 19" FP937s that I have kicking around instead of using the laptop screen. I tried setting it up in dual view and all that and got it working no problem but actually playing the game on it is a no go. So, is there a command line or something I need to put in to get it to display BF1942?

Thanks for all input!