Span an application across Dual screen in unity3d

Hi Guys,
I am suppose to make an application than must run on dual screen. Both of my screen have a resolution of 1920X1080.
How to publish an application that should cover both the screens.

PLz help,
thanks

I found the answer.
Please install a software name Ati Catalyst. Than if u right click you will get an option NVdia Control panel…than u can span any application across the screens.