Horizontal span vs dual view

I am coding a program that must run in Horizontal Span or in Dual View. I want to know when the application is executed how is my multimonitoring configuration and depending of this information I will create the right windows. The problem is that I can not retrieve the correct information about the multimonitoring configuration I have.
I just want to know if I am in dual view or horizontal span when the program is launched.

It should be enough to ask Windows whether there are 1 (span) or 2 monitors (Dual View).

There is an api for nVidia that should allow you to determine these settings.

Generally I find the performance in DualView to be poor and would recommend sticking with HSpan anyway.

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