Q for Yahoo admins : is the MVC design pattern used in the programming behind Yahoo Answers?

I ask because I am a programmer, and I find it amazing that all of a person's info stays updated between all the different Yahoo apps (mail, YA, etc). Is the 'listener' or 'observer' methodology used to accomplish this? I know you can't give away code secrets, I am just curious about the underlying design pattern or architecture. Any answers are GREATLY appreciated.