[Zope] Stupid WEBDAV question

Zopatistas, Please forgive my "thickness" on this question. I have been trying to do editing via WEBDAV for quite some time and have never gotten it to work. If I use IE 5.5, select Open (as webfolder) with "localhost:8080" as the location - I can see the Zope root folder files - but I can never edit or save (if I do open the document for editing, it's a local read-only copy). It's almost as though I am opening the folder as "anonymous user" - with the Zope "view" permission only. I am working on Windows 2000 Professional - with an instance of Zope/Medusa running locally. So, how does Zope know who I am when I access via WEBDAV? Is it using my Windows credentials for authentication? Thanks in advance, -Darin Lee