Please note this reply ^
But I don't think Surround uses windows. There was a section on setting it up to do a classic extend to the desktop or to only work in games excluding the desktop. I think windows is bypast. But Chaos would indeed know better.
Google links
https://www.reddit.com/r/fixindex/comments/3vmqzo/w_quickly_enabling_disabling_nvidia_surround_work/http://forums.guru3d.com/showthread.php?t=408896https://github.com/falahati/NVIDIASurroundToggler/issues/1I can't say if there is a solution there. I would think you would need to ask in an Nvidia developers forum.
More link spam... NvApi ? Why not?
https://developer.nvidia.com/nvapihttps://developer.nvidia.com
