How to detect exclusive mode?

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Hi.

Is there a way for me to find out if a window is in exclusive mode?

I have an HWND to a render window and would like to know if it's either
fullscreen or windowed.

Also, the process(1) that needs to know is not the process(2) that created
the directx window. Process(1) is a service with no UI.

Thanks
.

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