I worked on a VTC-20C, which had a Renishaw system installed, it was on the M Plus control though. Seemed to fit right in, I think any extra software needed came from Renishaw. Only problem was that Mazatrol does not protect the probe. If you tell it to go somewhere it does, regardless of what is in its path. Using it in ISO mode protects it a bit, if something touches the stylus it stops. But it is far easier to program in Mazatrol.