Hi sorry for the logn subjet :) I'm using Zope 2.7.5-final, python 2.3.5, linux2, and I'm just strating to code my first products. Here's my problem: I want to make a product that watchs instances from other products. for instance, let's say I have a product yy, with its add_yy_Form, manage_add_yy and class yy definitions, such that instances of yy just display memorised a string. now I want to build product xx such that when I create an instance of xx, I can tell it, throug the form provided by add_xx_form, which instance of yy I want it to watch at. (let's say for instance I want instance form yy to display the reverse of the chosen instance from xx) so I need add_yy_form to provide the end user with some kind of select from instances at hand (in current page, or in current page plus subpages would be nicer) and then I need the manage_add_yy to process that and be able to find the reference of the selected zope object. I thought of one solution : to provide a select with the url of the objects. So here come the questions : - is that ok, or is there a better way ? - is 'absolute_url()' the simplest way to find the urls for add_yy_form - if I manage to find a reference back from the url in manage_add_yy, what will happend if someone moves the object around, using copy/cut/paste for instance ? will what I think of as a reference still be pointing to the correct item ? (Note that my solution must not be specific to instances of xx : yy shall be able to watch instances from any kind of product) (sorry for such a simple question with such a long introduction... ) thanks!