That's really an application specific feature. There is no such global method to handle users. I've thought of it before, but such a system will be either too hard (you have to support some unlimited number of ways) to implement or impossible. You have to implement a new one for every application :)

However, there are generic applications like MS Passport or Bitcard but these might not be good from your point of view.

In reply to Re: Managing web user registrations, accounts, sessions by Burak
in thread Managing web user registrations, accounts, sessions by dmorgo

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