Hiding the URL

first and foremost, sorry, i had no idea where to post this (either client-side or server-side…could be either)…but question is:

how can i get the url not to display the path of the file?
ie. www.test.com/directory/login.php

i want the login.php file to display when someone goes to www.test.com and they will only see in the URL: [URL=“http://www.test.com”]http://www.test.com and not the rest.

is this possible? thoughts?
thanks!