accessing CUDA driver functions via ctypes on Windows

As far as I know, the necessary dll is not installed by the CUDA 6.5 toolkit, but is installed by the GPU driver installer. driver api applicaitons should be linked against cuda.lib The dll is nvcuda.dll I believe. For 64-bit windows, nvcuda.dll is installed in C:\Windows\System32 and C:\Windows\SysWOW64