[Zope] document versions

I know that Zope has the capabality to keep up some sort of version managament system for zope documents. I have two questions concerning this. One, where might I find some more info concerning this. And two, what if I want to use my fav editor - say vi or pico...but that's another war I don't want to start ;)...instead of the window that zope provides. IF the file already exists in zope, and then I go and make changes in a separate editor, and upload the file, since I am uploading the file, will zope keep track of this as just another version of the same file? Thanks. The Very New Newbie to Zope, Jessica