Macro_capability_detailed.htm is a file, not a folder. Click on it and you will see what's in it. Not really instructions, just description of the functions supported by UCCNC. You need much more than that to learn, at least if you define "learning" as equal to knowing something, not just making small simple changes. Macro_capability_detailed.htm is not a teaching aid, it is intended to help those who know how to program, a user guide for programmers.