I reckon that: 1) Without ZClasses, I am lost 2) Without external methods using ZClasses, I am lost 3) to make 1) and 2) happen, I need to create new products hence 4) I need to ask my provider to let me install my own products (at a premium, of course, because it's a zope virtual server for me alone). Right? Why is it so? Is it a philosophical, political or technical choice? And again, sorry to bother you, but where can I understand the difference (and moral implications) between Python Methods and External Methods? I've read in the mailing list archive about some problems between Ext. Meth. and ZClasses, I can't find the post anymore. At the time, I didn't know that I needed ZClasses. Is there any truth? Thanks! Thanks! Thanks! Thanks! (in particular to DigiCool for adding some spice to our lives!)