Multiple Monitors

How do I swet up two monitors for use in FS? I can use two normally with an extended desktop but I can't see how to use them in FS.
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=10&t=27933
if I wanted to run four monitors from one pc, could I use two Y adapters connected to the video outputs on the video card.
Skittles, if I wanted to run four monitors from one pc, could I use two Y adapters connected to the video outputs on the video card. Would that setup be to hard on the computer.
I'm planning on having a pilot and co-pilot set up and want to run two monitors on each side. One for visual and one for gauges.