Windows 10: Use only iGPU for desktop rendering

Hi all!
Im on a laptop with an Intel iGPU and an Nvidia dGPU. In Linux, I had the option of choosing what GPU should render the desktop. Given the fact that i use CUDA for programming, where for performance and benchmark purposes i cant allow anything but my code to run on the dGPU, I would like to know if Windows allows to set the desktop render GPU and where to find that option. Thank you very much!

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Desktop Windows Manager Eating up igpu

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Multi-Monitor and iGPU and dGPU usage/load

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I have an iGPU Intel HD4000 on my 3770k CPU, I also have a dGPU Nvidia GTX690 in a Multi-Monitor setup. Connected to my GTX690 are 3 monitors, and connected to my HD4000 is a 4th accessory display.

What happens is that when I play a video using VLC on the monitor connected to the iGPU, all content is actually rendered on the dGPU, then sent over the PCIe bus to the iGPU and displayed from there. I don't want my dGPU adapter to have anything to do with
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2. When dGPU is set as Main Display then; iGPU 18% usage,
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In the first case where the monitor connceted to the iGPU is set as main display, everything works as I want it, only the iGPU does work as it outputs the video to its monitor. But I don't want to have my iGPU as Main Display, I want the dGPU as Main.

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How can I assign a different Display Adapter to a program, other then the "Main Display" (which all programs default to, regardless of which monitor they actually appear on)???

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