I'm a bit shy about the details but it's used by engineers. Actually there's a lot of opportunity in software for engineers. They pay huge prices and the quality of what they have is often poor. I'm aware of some gaps in the market. For example, modeling thermal distortion due to robot welding. That's not what my product does but that's one where the existing solutions are something like $50,000/year and it's a hard problem in part because the software has to run faster than an actual welding robot making a prototype to be economical to model it in the first place. It takes some clever research to invent the secret sauce to get those speeds.