How It Works? A Consumer POV. 

• a web site 'consume's OpenIDs

• you type your OpenID (andychilton.myopenid.com)

• the consumer finds:

<link rel="openid.server" href="http://www.myopenid.com/server" />

• the consumer asks your 'homesite' questions:

• like "is this person logged in?"

• and can you verify who they say they are