I have a sister, who is a genius on anything unix based... She set me up with a .htaccess file that allows me to host two Drupal sites, each in their own folder. I did some extensive searching for such code, and found absolutely NOTHING that outlined something as simple as pointing domaina.com to folder /h/domaina.com, and domainb.com to folder /h/domainb.com. I tried all sorts of configurations but ultimately was unsuccessful.