[Zope] LocalFS updating files via DTML?

Hi *, I have several comma delimetered text files on the local file system, which I can render via Zope using the LocalFS product. Question - Is it at all possible to update these files via some DTML calls? eg. Once a user submits a form, I call some ZSQL Methods and this data is used to update the text files - without them accessing the ZMI? Regards, Michael Fox