How do sites like stackoverrflow use the login ID to login to the site?

Question

How are sites like stackoverrflow using the third login identifier (gmail, blogspot) to access the site?

How to do this in asp.net? Give me an idea to implement this in my application.

I have no idea where it came from. I have to start this.

Answer 1

OpenID is a decentralized system for authenticating users through third-party providers such as OpenID, Google, and AOL.

http://openid.net/

http://en.wikipedia.org/wiki/OpenID

http://weblogs.asp.net/plip/archive/2008/02/02/openid-in-asp-net.aspx

Answer 2

OpenID, - asp.net

Answer 3

OPEN ID. .NET . id.

Wikipedia

OpenID - , , , , . OpenID , , . OpenID , .