Multiple Monitors

How do I set up 2 monitors in FS? I can get them to work normally with an extended desktop but I can't see how to use them in FS. I think the graphics card is a Mobility Radeon 9000.
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=9&t=22896