Dual monitor setup question

[Triple_7]

Had a little spare time and found my extra monitor.  Now that I hooked it all up I can't figure out some things.  I have seen it done in fs where you can have your main display set for the main views and then use the second monitor for your atc, gauges, etc windows....what do i need to set in order to do this

[eno]

Start FS in windowed mode ..... undock the gauges and drag them across ..... if you fly in fullscreen then go back to that.