Virtual host wikis

I downloaded the latest source from svn and noticed that xwiki.cfg has this: wiki.virtual=1 xwiki.virtual.redirect=http://127.0.0.1:9080/xwiki/bin/Main/ThisWikiDoesNotExist is there any documentation on this as it's a useful feature we could use. -- Alistair Young Senior Software Engineer UHI@Sabhal Mòr Ostaig Isle of Skye Scotland