I will try this course over the next week or so.
I should have been more specific, however. I am looking for info on classes/methods that access TurboCAD data structures and commands. In the Ruby sample script named "TC20_RubyImportXYZPoints.rb", there are references to tcGr, tcVerts, and a few other classes that access drawing commands and vertices data structures. I am interested in selecting a set of vertices in a drawing and then exporting their coordinates to a text file. The Ruby example shows how to import vertices and I want to export (selected) vertices.