Hi,
> Yesterday I saw a document containing something about portals in portals ...
> I would really like to read it today ... but I forgot to bookmark ir :-(
The document you are searching for must be that one:
http://cmf.zope.org/doc/FAQ -> 4. CMF Development
And yes, at the beginning I also found it tricky to find the FAQ back ;)
Kind regards,
-- SB aka Big.