With this guide, you get a detailed look at OpenID, an emerging technology for managing digital identity. This open standard not only helps you provide customers with easy and secure access to your website, it can help you reduce the costs and complexity associated with account maintenance and access control. Written by some of the creators and early implementers of this technology, OpenID: The Definitive Guide will give you a firm grounding in OpenID, along with best practice guidelines and clear examples to help you implement it. You'll learn how OpenID enables your visitors to easily reuse an existing account - such as their Google or Yahoo account -- to connect with your website and many others.