Alrighty, those are some good pointers.
The monitors show up side by side, and I can select either and set it to primary.
I would configure 2 screens (2x 1680 x 1050) to become 1 big screen: 3360 x 1050 in DCS, with an aspect ratio of 3.2.
My 'headless' would be set to primary, and I would orient it to be the left monitor.
Nothing should be displayed on the first 1680x1050, so center would be:
X = 1680 (or 1681?)
Y = 0
?
I don't know what the differences between Viewports and UI etc are. Essentially, all output should happen in the right half of the 3360 x 1050 screen.
Do you have some more primers for me?
Cheers,
Geo