I think that we have a misunderstanding, most definitely on my side.
I ran FSX, and now prepared v3.1, across two or three screens. Two screens when I do a screen capture for posting on Simviation.
For the most part, when I use Plan-G I simply use
Alt Tab to pop it up on the right hand monitor
(actually, Alt + Tab is assigned to a button using SPAD.neXt).
As I understand it now, you two are using the monitor on another computer to see Plan-G.
In my setup, I have the three main monitors attached to the three outputs of my R9280 AMD Eyefinity card.
I have two nine inch USB monitors dedicated to off-screen instruments.
That worked well until I bought the
DesktopAviator GPS. This is a simple VGA monitor in a panel with buttons.
The Eyefinity cards will only connect to three monitors, but the GPS was number four.
There were two ways to go at the situation. The first one that I tried was a USB to VGA converter. All four monitors worked.

But I had an older Eyefinity card and started to wonder if it'd work alongside the other card.
Surprisingly, after installation the three main monitors worked off the faster card.
The GPS and two USB monitors were assigned to the slower card, which was not a problem as they didn't need the higher speed.
(These are from an older post.)


There was one more surprise - with the USB monitors being driven by the other card, it took a small amount of load off the primary video card.
The end result was an extra 4 or 5 FPS in FSX, and an extra 5 to 6 FPS in Prepar3d V2!
Again, this may not be the solution that you were looking for, but if you have a spare video card it might be a viable solution to a fourth monitor for Plan-G on one computer.
One other note. When I look at this now it looks kind of rude. It wasn't my intention. Sorry.
OldAirmail wrote:I know what YOU want to do, but do you HAVE to use Plan-G on a separate computer? ....