This is an old revision of the document!
Someone using a Windows 10 system with onboard Intel graphics and an nVidia RTX card asked how to force binvox to use the nVidia card.
This looks to be something you set at the OS level (at least for Windows).
Check out these pages:
https://winaero.com/set-preferred-gpu-apps-windows-10/
https://www.tenforums.com/tutorials/103965-set-preferred-gpu-apps-windows-10-a.html