Forcing NVIDIA GPU programmatically in Optimus laptops

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According to http://developer.download.nvidia.com/devzone/devcenter/gamegraphics/files/OptimusRenderingPolicies.pdf starting from 302 drivers it is enough to link statically with one of the following libraries: vcamp110.dll, vcamp110d.dll, nvapi.dll, nvapi64.dll, opencl.dll, nvcuda.dll, cudart*.*, or to export a NvOptimusEnablement variable in your program:

extern "C" {
    _declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
}

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