Thanks Craig… I think you correct . these Lua statement are call to a spot on the .ini and not the registers. After a year I decided to pull the plug on Mach4. Artsoft has docmention to get you started but it falls of a cliff beyond that. Given the unlaying complexity of the db 25 legacy, the software and hardware split... the lack of documentation is a huge and needless consumer of time. The email support is mostly cut and paste stock answers regardless of the question. tTe grass at Centroid looks greener.... We'll see Thanks again