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Both Windows and Macintosh have built-in WebDAV support in the operating system. Windows makes WebDAV available via Network Folders. Macintosh has WebDAV support in the Finder.
WebDAV in Windows network places are available here.
General directions for Windows, Macintosh, and other clients are available here.WebDAV in Windows network places are available here.
Subversion is also available if you'd like to implement version control for your site(s). Please see here for more information.
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