Now that is an excellent question. I have my eye on a Dunford Novamill which runs VR, but I think that turns G code into something the machine understands, but how that g code gets made, and how that is based on some sort of computer model I "draw" is a complete mystery to me. I was hoping something mad like, "it's a generic file type and any package works fine with VR" might be a bit optimistic...