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Does Stackoverflow create a new OpenID when a user registers with an email address (i.e. does not provide an existing OpenID)? How do you do that? Do you have code examples in C#? Java? Python?
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Simply put, OpenID is used for authentication while OAuth is used for authorization. OpenID was created for federated authentication, meaning that it lets a third-party application authenticate users for you using accounts that you already have.
You can find OpenID implementations here. If you just want more information, I would check out the OpenID site.
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The Plaxo OpenID recipe (from the OpenID site) was one of the better howtos I've seen.
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