Where is the Launchpad database stored and is there a way to edit it directly?

When exploring the new Launchpad feature, at first, it would seem as is it draws it's content primarily from the Programs folder. It seems to be the case, however, that the Launchpad database is drawn from somewhere else. For example, when installing a game through Steam, the game itself will not show up in the Programs folder, but *will* show up in Launchpad. In this particular case, I *want* it to be in Launchpad. The *drawbacks*, however, are that I am unable to remove the game from Launchpad and am unable to change the icon. **Where can I *directly* view and modify *every* Launchpad occurrence?**