I have one more question pertaining specifically to the integrated computer model. Do I need an OS to load onto the computer or is there one already pre installed?

On our CNC computer systems, we provided all the hardware required for a fully functional control package. But software items are not included OS systems and Supporting Software are not include, however if windows 7 is ordered we supply the mach 3 demo. We do not add the OS system to our systems, due to the options that our customers have either going with(linux, windows).