I have written the attached two pages (PDF and ODT) to clarify my ideas and organize answers to my questions found in the forum. I would appreciate cross reviews to make sure I got it right, and complements if I missed something important. I intend to put a version of it on my site, when I will open access to EzS, eventually completed with FAQ depending on users reactions.

It might be useful for others. if so I will update it, depending on comments and suggestions received. Otherwise feell free to use whichever part one would find useful for his own purpose. No credentials needed.