Actions On User Registration

[RyanIMC]

Hi I am running vB 3.6.4 and was wondering a few things, how would I take action or call some php function after a user has signed up? For instance when a user signs up on my forum I want to create an album for them in another program, I basically need to run some php calling a mysql database saying create albums for this user. But where would this code go?

I saw someone created a product that puts a member into a certain group when they sign up based on a custom profile field, I think this is the area I'm looking to insert code into.

I was also wondering how I could add another default folder in the Inbox/Sent Items drop down menus. Like if I wanted everyone to have a default folder called 'Mail From Admin' which would take them to folderid=-2.

Thanks in advance.