[om: Dag Nygren]

I now finally figured out the parameter-passing stuff and ran into a new problem: I need to change the REQUEST on the client, presumably in a javascript

Can this be done and How ?

There is no such thing. The browser client has form data that it submits, and the Zope REQUEST object ends up containing the form data. The client knows nothing about Zope objects. Tell us what you really want to accomplish and we will help you work out how to do it. Cheers, Tom P