From what I recall it uses a driver (rather than a program like Mach3) to generate the machine moves from Corell. It operates like a printer driver and is basically transparent, you just print to the machine after setting up the parameters for the machine in the driver set up.
There is a similar technology advertised here on the zone for laser cutting but I don't recall the name offhand.
Halfnutz
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)