I have an large ASP.Net web application that will have a large number of users and I want to make this site accessible from other sites by take the credentials uses to have authentication to other sites on another domains, to make it easy to understand from you the idea like this site we can access it by using Yahoo, Google or Facebook account
my web application use form authentications.
any Idea to do this
Thanks all
I have tried to find out the links which might help you in your course to support multi-website authentication :-
Facebook Authentication
Google Authentication
OpenId