How to Fetch Yahoo Address List of any user

Sent by Tejas Lakhani

I just want to know that how to fetch Yahoo address list of any user who provide his/her username and password and login in my website. I want the stuffs like it has in www.ringo.com where a person who is a member of ringo can easily login to any of his account like Yahoo,MSN,gmail and it automatically fetches its friends list from it and display it on ringo's member page who signed in using his/her username and password. I want to implement the same idea in to my site so may I know how to implement this.