authentication
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documentation
Getting Started — OAuth
Hueniverse publishes a guide which covers many of the topics needed to understand and implement the protocol and is available in multiple parts. The Beginner’s Guide to OAuth includes: Part I: Overview Introduction End-user Benefits Scope Specification Structure Definitions
Yahoo!'s commitment to open standards includes our support for industry-standard protocols for authentication (sign-in) and authorization (access control). Yahoo!
Browser-Based Authentication