Multiple xwiki

Hi, I new on this list and I'm not a native English speaker (so sorry by any misspelling). I would like to know if its possible or if some one have setup a multiple xwiki contexts in only one data base model. I didn't find anything about it on FAQ. So the idea is to have more than one xwiki running in one o more servers accessing the same data base; but considering that each xwiki "instance" will have its own data, menu layouts and so. I have found this FAQ http://www.xwiki.org/xwiki/bin/view/FAQ/HowToSetupVirtualWikis but it treats about multiple xwiki instances accessing different data bases. Please, any help will be very welcome. If someone knows about any docs that I can read... Best regards, Igor Regis