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WebDAV is "Web Distributed Authoring and Versioning" - A built-in XP feature to allow collaborative document authoring control on remote servers. Basically, it allows multiple authors at multiple sites to "share" a document and work on it at the same time. You can find documentation on the web and at microsoft.com. Of course, Microsoft assumes that everyone will support it and allow it on their servers... Yeah, right!
Most of these kind of accesses come from people who unintentionally use the "wrong tools" to surf the web, like clicking a link in IE and having it open in Excel. Excel and XP then try to open an editing session on the hosting server. If the hosting server doesn't support this, it eventually falls back to a "view-only" mode. My only problem with it is that the handshake involves about six attempts to access multiple lock/unlock/file reservation files - I wish it would just give up after one try.
Another poorly-implemented good idea...
Jim