Thanks again for your reply. I have RTM several times, so many times, in fact, that their are notes and comments and underlines on many of the pages. Many of the comments are: "Huh?" because it is one of the most vague computer manuals I have every read. A big part of that is, I am sure, my lack of familiarity with machining, but I expect there are a fair number of Mach3 users who are not engineers or machinists.
I opened Turn V1.84 in Adobe again, went to File>Find and typed in "REGEN" in the find window. I made sure case sensitive was unchecked and still found only two instances of this phrase both as I described in my last post. I am not sure what I am doing differently than you are, but I cannot replicate what you describe. Thanks anyway though. Frank