I need to know whether I can set up clone and delete methods in a Zclass that automatically get invoked any time someone deletes or copies an instance of that class from the management interface (via cut and paste or whatever). What I'm doing is creating a simple link class that just stores the key to a RDBMS row that contains all the details of the link (description, URL, clickthrus etc). The trouble is that when a link is deleted from Zope, it needs to touch the db record or that record will become orphaned - ideally the db record needs to keep a reference count of the number of link objects out their, and they need to increment or decrement that count as they get copied and deleted. So can this be done with a ZClass (if not, why not :-)) and if it can't, how can I do this with a Python Product (given that I've never written one!). TIA, John.