[OpenID] about sso with openid

[陶平]

Hi,
    
     In the project new, we want to fulfill SSO between some systems. and for the reason, the customer required that every system have its own user data.we have read some material about openid, and want to use it, but still have no clearly idea about it, and how to use it. except share user information between systems, and what others openid can do. and is there anybody have met the seem requirments? 
thanks
 
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