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VirtualHostFolder
Requires Python 2.x (and Zope 2.4+), and Stephan Richter's OrderedFolder 0.4 or higher
The VirtualHostFolder product, based on some nuts and bolts of the SiteAccess Virtual Host Monster by Evan Simpson and modified by iMeme, provides tools for modifying the traversal of Zope in such a way as to provide for multi-site hosting in Zope. It follows a power-tool approach--make sure you know what you are doing when you use the more esoteric options like aliases and templates.
More information is available at http://zope.org/Members/poster/VHF , and also see http://sourceforge.net/projects/vhf/ if you'd like to participate.
Alias functionality currently has problems working with ZPTs on the far side of an Alias that reference a standard CMF skin in the pre-Alias traversal. This can be solved by adding security.declareObjectPublic() to all of the cmf tools (or security.declareObjectProtected as long as all users that should be able to access any of your pages, presumably including anonymous ones, have rights to address the tool objects). I have contacted Tres Seaver at Zope Corp to see if this change can be made to the actual CMF distribution.
The original SiteAccess information can be found at http://zope.org/Members/4am/SiteAccess, and is included with the standard Zope distribution.
iMeme's product can be found at http://www.zope.org/Members/sfm/SiteAccessEnhanced .
Feedback appreciated
Gary Poster