HNC is provided with the machine (basic nc). ISNC is the (Industry Standard NC) which is Fanuc code is the option. I use only Conversational and HNC. We make all kinds of 3D parts with complex shapes. We use mastercam to program the 3D and conversational to do the rest. You just have to make sure your post is configured to write Basic NC. Small differences from ISNC. We have had great luck with our VM2 and it cuts fast and accurate. It is now 4 years old. I would buy another one in a heart beat. In fact Hurco I thought has an offer for a 4th axis with Winmax for what we paid for a our machine.
Jetski (alias Tooling and Engineering Czar)
"I may not have the keys to success.. but I have learned to pick the locks"