Target Locked...

Checked in with the support forum at UltraMon today, and got a couple of pointers back VERY quickly. As it happens, the application was operating exactly as expected. There's a couple of caveats with the resolutions switching, but in essence, having the primary monitor on the left causes the screen area to shift. 

I borrowed the wife's monitor this evening, set it up as a secondary monitor, told Windows it was on the left (It isn't, just in case the pics below confuse you).

It only took a short while to prove that the concept works! 

Running the mirror in a Window for testing.
When not in flight, the screen is blank as the mirrored screen area is invalid.

XWA switches to 640x480 during the start screen, and in the flight hanger, whilst running the game engine in HD means I am trying to capture an area around the (700,800)-(1300,1080) mark. This means that from the point the application is started, to the point one is in flight, the second screen is blank. As soon as the game starts, the targeting screen hits the display. PERFECT

Running the mirror in full-screen, between missions.

There's no way I could "Draw" over the Direct 3D image.
A bit of Tape helped to find the correct area.
I have the exact settings saved, but they will change when I settle on a final resolution.

The images below are taken after turning off the cockpit.This has no effect, it's just by habit.

 

In Flight, no target.

The final image below shows the main monitor (physically left) running the updated game engine at 1920x1080. The game plays with no noticable impact on performance.

The portion of screen containing the targeting computer is shown, real-time and full screen on the second monitor.

Pew! Pew!

There seems to be an issue with flickering on the target display... but only on occasion. Generally it runs as hoped. A little tweaking or extra memory should fix this.

At the moment, it seems low quality, but it's stretched to a widescreen 19" panel.

Now that I know this works as well as it does, I will be looking to get hold of a small monitor, something like a Lilliput, but it will have to be quite a bit cheaper!