[Zope-dev] Version Control

I'm looking at ZOPE to be used to act a version control for some documents. I have used the Version object in Zope but unable to satisfy my requirements. Couple of questions regarding that, 1) Does a new Version object needs to be created, everytime a change has to be made? 2) How can I list all the version changes undergone by a zope object? 3) Can I view a previous version of a document without undoing to that version. Even if ZOPE does not provide these functionalities directly, please provide me with the Classes and Modules which should be extended. Thanks in advance.