David Thank you for your reply.

With ZClasses you can use the Zope security support to control who updates what. However, currently ZClasses can only go in the Control_Panel/Products folder. This means that all tutors will see the products/classes used by all other tutors, which you say you wish to avoid.

I may have misled you about what I meant by the alien stuff that I wanted tutors to avoid seeing. I envisaged turning a tutor's site into a product that could be instantiated. In order not to make copies of static files, I reckoned that each folder in the tutor's original site would have to be made into its own ZClass in order that the static files that were missing from instances of the site could be found through inheritance. I'm happy with a tutor's site being moved into the Products folder; the stuff I wanted tutors to avoid seeing wasn't other products, since I think it should be possible to provide them with an interface that takes them straight to their own product. Rather I wasn't sure whether it was possible to turn a tutor's site into a product that used folderish ZClasses instead of ordinary folders, yet still have it feel like their old site. One issue with what I'm suggesting is this idea of every folder in the tutor's productised site really being a folderish ZClass. I'm bothered by this profusion of ZClasses. I think what I really need is the concept of prototype folders, whereby if a folder in an instance of the site didn't itself contain the required object, its prototype folder would be looked in instead; the folders in the product would be just ordinary folders rather than individual ZClasses, and folders within the product instances would all be instances of a single PrototypedFolder class (though obviously pointing to different folders as their prototype), thus drastically reducing the number of classes required. But I don't know whether such a prototype mechanism exists for Zope. Hamish Lawson University of St Andrews, Scotland ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie