These are DataCAD builtin function entry points.
Look at INC files for more builtin functions in the INC folder.
And look this:
https://www.datacad.com/ddn/downloads/New%20Builtins.txt
Look at INC files for more builtin functions in the INC folder.
And look this:
https://www.datacad.com/ddn/downloads/New%20Builtins.txt