[development] Debugging a multi-site

[Jeff Greenberg]

When I set up a project in my ide, phpED, it asks for the file path to 
the file to run first, typically index.php, etc., and not a url.  So, 
when working with a multi-site setup, is there a query string that I can 
use to let Drupal know which domain is being requested, since any domain 
in the multi-site is going to begin with index.php?