[Zope] Export usernames and passwords

Hi I have a Plone-site that has a bunch of registered users. How can I export both usernames AND passwords from the zope-database. I want to use these to access another application. Please don't answer "You just have to write a script", because I don't know how to do that. My config: Linux Plone 2.03 Zope 2.7.1 Python 2.3.3 Kind regards Oystein