Who to address an update letter to - dean or admissions? Also, a waitlist question.

Hello everyone, I would like to send an update letter to the medical programs I have applied to. I already found out which schools accept/do not accept such letters. Now I'm trying to figure out who to address the letters to (for those schools that do not accept updates via online portal). I heard that I should send my letter to the dean at each school if I can find his/her contact info. Is this so? Or are there schools that prefer that I send the letter to general admissions instead of... Who to address an update letter to - dean or admissions? Also, a waitlist question.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums