Share ASP.Net web application authentication with another web sites
<p>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</p>

<p>my web application use form authentications.</p>

<p>any Idea to do this</p>

<p>Thanks all</p>
