Before CELOS the CNC operator‘s main access to the machine was the HMI user interface of one of the few NC manufacturers like SIEMENS, HEIDENHAIN, FANUC or Mitsubishi. The advanced power user of such an UI was able to read the complex UI with an extreme information density and understand the machine‘s needs. It would take him 5 years at least to become a skilled worker, rather 10 in order to be a master in operating such a software. The idea behind CELOS is to function as layer on top of the sophisticated HMI which should simplify the operation especially for the less skilled worker / user. Besides CELOS functions as an application eco system where external developers are welcome to develop apps that enhance the HMI.