[Zope] Python Script Security

[Richard Harley]

Hello all

I have a dtml method which builds a page from various different python 
scripts.
How can I stop the python scripts from being called and passed variables 
independently of the main dtml method? I've tried some research on proxy 
roles but couldn't pin it down.  ZSQL methods are not callable 
independently and I would like Python Scripts to behave the same.
TIA
Rich