http://www.serverwatch.com/tutorials/article.php/2176771

<snippet>
In order to simplify the way you update websites, WebDAV was invented.
Web-based Distributed Authoring and Versioning (WebDAV) uses extensions to
the existing HTTP protocol to enable multiple users to manage and modify the
files in a remote system. Using suitably enabled clients you can view, open,
edit and save files directly into the filesystem of the Web site as it were
of a remote website.

There are some obvious immediate benefits of this, not least of which the
ability to edit the website without jumping through too many hoops, but it's
the inventive use of the technology beyond editing a remote website that has
lead to a recent explosion in interest of WebDAV. Nowhere is this explosion
more prevalent than in the Mac OS X arena, where the iCal calendar
application, provided free by Apple, can publish calendars to a WebDAV
server so that other users can subscribe to the calendars and find out what
you're doing.
</snippet>

Since it's http, it passes through firewalls too.  I don't know if anyone
has build the webdav modules on MPE yet...

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