home page of web address

Hello to all
I am making the project coding in c# and designing in silverlight3
suppose user have a grid and in grid user have stored lot of web address and login and password of those web address..so that he don't need to go to any particular site and enter login password of that web.

Now user wants to open his orkut account,acting as a ADMIN I don't know that which website the user is going to open.
Now in the grid when user click on orkut.com , directly the home page of the user should be open..
as he already the user stored his username and password of orkut account..

how it is possible
please help me as soon as possible