[Zope] REQUEST.set question

I'm going through the code examples in the Zope Bible and I can't get the following to work: I've created a Python(Script) called 'hello' with 'name' on the parameter list and the following script body - return "Hello %s!" % name and a DTML Document with - <dtml-call "REQUEST.set('name', 'John')"> <dtml-var hello> when I view the document I get Error Type: TypeError Error Value: hello() takes exactly 1 argument (0 given) I understand that Zope should get the parameter from the REQUEST object automagically for me but it doesn't seem to do that. Is it me, or the book? Could someone shed some light on this..... FYI, I'm using a binary release of Zope 2.6.1 Thanks, Mark.