DNC or file transfer between computer and CNC Control. You can use ConnectCNC for any number of machines, and simultaneous transfer or DNC capability is limited only by the number of COM ports on your PC. Note that each of the CNC controls in your shop can have its unique configuration and port designation. Try ConnectCNC free for thirty days. We offer ConnectCNC as an alternative to the very powerful, but very expensive DNC programs that have features most users don't need.