For what it is worth..
I dusted off my old laptop that I had a dual boot, Vista and WindowsXP and hooked up an old monitor to it.
Right clicked on the XP desktop selected Graphics Options > Extended Desktop.
Then started MA33jBeta and it showed on only my laptop. Went to settings Selected tab for Monitor 2 and selected Display screen saver on this desktop.. Nothing
Right click on MA3 get mini menu and selected "Windowed" instead of "Full screen" and
bingo ![Big Grin](/forums/images/smilies/biggrin.gif)
MA3 is on both monitors with fish swimming from one to the other.
The selection from the main settings (space bar) Display Settings has a place to "Render same image on all monitors". That too is dependent on the "Windowed or Full Screen" selection.
Looking at the right click menu on my desktop I notice I also have a selection for "Intel Dual Display Clone", where I then have an option to select Notebook+Monitor or Monitor+Notebook. Selecting this lot and the MA3 settings section changes a bit. The Display tab no longer gives a choice about monitors. This makes sense when I think about it as both monitors are synced and act as one. MA3 will play on each (identically) and there is a performance hit as the mouse pointer flickers and the FPS drop to ~36