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Sep 06, 2011 08:38 AM|LINK
I think you are thinking about openID? right if so you can google from openID, this will allow user authenticated in another website/webapp like twitter or facebook or google mail etc.... be able to use their authentication into your website.
Extension to openID should be available but may require a lot of knowledge and coding.
You can also write your own, you have to write authentication classes, have an endpoint configured(WCF) and then expose your authentication classes to remote users and sign an agreement with the other websites so that they can use your authentication. And
all of this can be messy depends on your activities but I don't see any point of doing so if you are just a small company.