[OpenID] How to prove identity without leaving RP?

[Jean-Noel Colin]

Hi

The OpenID Auth 2.0 specs mention in the abstract that it should be  
possible for an end user to 'prove their identity to a relying party  
without having to leave their current web page'.

Of course, this sounds more user-friendly than sending the user to the  
OP's page to authenticate, then back to the RP's page.

However, I don't quite understand how this is technically feasible.  
The specs mention AJAX-style setup

Another unclear statement is found later in the doc: "An example of a  
situation where interaction between the end user and the OP is not  
desired is when the authentication request is happening asynchronously  
in JavaScript." How is this possible?

Thanks a lot for clarifying this

Best regards

Jean-Noel Colin