Thanks to Lee Anderson for this excellent tutorial - particularly useful on closed intranets where you may have a host-header to create a "short name" for your internet in user's url address bar.
(...which is easier than 6 for once)
This example is for a CNAME.
There is a catch, if you are attempting to view the site via the host server, you will probably get tripped up by the loopback check. To get around this view the site from another PC