[Zope] How to prevent the user from going "Back" to a page???

[Chris McDonough]

> Use a session tracking product, that'll give you a session id and ocne the
> session is complete, you can return an error if that session id is
presented
> again.

I'd probably handle this instead by computing an identifier for the
transaction and including it as a hidden form field on the submission page.
Keeping one day's worth of transaction ids somewhere to check against in the
form action would probably suffice.