Perhaps somebody familiar with American drafting/building practices and confident about his own ability to produce the smartest window door/window GDL library in the world could e-mail them a brief explanation and a budget (and some US ArchiCAD user base data, which I am not sure if it will help or not!).
The Anderson library is presently available on the Graphisoft site. I have downloaded the Marvin and Pella libraries, tried the Marvin library in ArchiCAD v9, and it seems to work, even though it was made for v.7.
If anyone has mere recent libraries, please let me know.