Forgive me if this has already been answered, but what is this 'modules' idea? Adding optional small features on top of what the document class provides?
It looks like this: when you use for example beamer.layout, but needs an additional subsubsubsection entry which does not yet exist. You will have to modify beamer.layout and add it. The modules would allow you to use multiple modules (layouts?) to accomplish this. I do not know the details though. Bo
