6
enter
http://localhost in the url path in mainfile.php
then do the path to the xampp htdocs folder or where your XOOPS is located on your pc.
then you call your site by entering
http://localhost/ in your browser.
but that will only give you local access, it won't be accessible for other users on the internet, to do that you would need to use your IP & tell every1 everytime it changes. so if you want internet users to access, you need to setup a dns for your PC.
something like
http://www.noip.com will do that.