Ivan Irons has some experience with Mach, which makes this a very informational webpage. For those of you who may not be familiar with Mach or Artsoft, it is actually a type of Computer Numerical Control software. Control Software is software that takes your Gcode and interprets it for your Computer Numerical Control Machine. Once Mach, or your control software, takes the interpretation of the Gcode line-by-line instructions, it will send off commands to your machine controller. You can read more about CNC Control software at your convenience at the following website: Art Soft