[support] Adding users, comments and fivestar ratings directly to the database

Hi, I am working on making my ROR(ruby on rails) application work with a drupal install. The user can add comments and ratings via both drupal interface as well as the ROR application. How should i go about it? I have made some headway in adding comments. How can we add drupal users directly to the database. The 'data' field in users table seems somewhat tricky. Anything else that i need to take care of? Also how do i add fivestar(drupal rating plugin) ratings directly from my ROR application. Any help will be appreciated. Thanks and Regards, Amit Saxena