You're kidding, right? A good interviewer will grill you regarding CNC operations, and may very ask you development type questions. Be prepared to talk about OMW, OCM, spec files, security, upgrades, web solution, architecture, performance, reading log files, etc. My last interview they handed me a debug file and aske me for the solution. I was also give a logic test to assess how I tackle an issue, not neccessarily come up with the correct answer. You will be assessed on you confidence level of addressing issues, not neccessarily the correct answer, as solutions vary between releases. No offense intended, but since you felt the need to aske this question, I wouldn't hire you. A good CNC person would already know.