not sure, i believe that would be more of a server access rule, which i have no clue to, maybe someone like nsane could tell you more in that department
here is some sites that might give you more info
http://zope.astafu.de/5
http://coldlink.com/
or the last post in this topic: http://www.webmasterworld.com/forum92/33-3-10.htm
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