OpenID and the Identity Systems of Yahoo, Google & MSN - ReadWriteWeb You may've heard of OpenID - it's a distributed identity management system, a.k.a. a decentralized single sign-on platform. We prepared a screencast to better explain the idea (see Flash movie below). Written by Emre Sokullu and edited by Richard MacManus You may've heard of OpenID - it's a distributed identity management system, a.k.a. a decentralized single sign-on platform. We prepared a screencast to better explain the idea (see Flash movie below). After that we present a more detailed explanation, focusing particularly on Yahoo and Google. In the screencast we use a real in Public bookmarkswith authenticationauthorizationcome-back-2googleidentityopenidsecuritywebweb-2.0by 3 users