[xwiki-users] DNS mapping

In setting up our wiki farm, we'd like to do this: http://www.oursite.com/xwiki = the XEM manager http://wiki.oursite.com/xwiki = internal wiki http://client1.oursite.com/xwiki = Client 1's wiki http://client2.oursite.com/xwiki = Client 2's wiki How do we go about doing this? I've got the wikis themselves set up and responding properly using my HOSTS file (mapping each of those to the same IP), but how is it done in a "production" environment (for both internal and external clients)? We don't have our own DNS server, we rely on the ISP. Are these subdomains? Or different hosts of the "oursite.com" domain? Yes, I've searched for answers and have read about DNS and subdomains, etc. but it's just not sinking in. Anyone have a good link for reference? Any help would be appreciated! Thanks, Trevor