Okay, got it. So, if i understood correctly, even the Sims are SimAntics programs? Also, i know of other tools like that, stuff like IFFPencil and Transmogrifier.
For the most part, yes! SimAntics runs all of their interactions, though the code is usually included in the objects themselves. Even their idle animations are controlled by SimAntics. The only parts not done by SimAntics are the routing system and renderer.