Use a second monitor, but not extended desktop

I am trying to get my C++ application to display images in fullscreen mode on a second monitor, or with a multimedia projector (on Windows). I have a second graphics card. My problem is, in order to display those images, I have to activate the second monitor, and this enables “extended desktop” mode, which means that the mouse cursor and windows can move into the second screen, which makes no sense for my application. Does anyone know how to draw images to a second monitor without enabling extended desktop? A truly “independent display.” Is there an OpenGL call that can do this?

Thanks in advance.

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