From the usability perpective, it is perfect to authenticate with google at all type of pages with my Google OpenID (for example on stackexchange).
But I do not really know what happens when I do so. Especially I would like to get a list for all the pages where I authenticated myself with OpenID with google.
Does such a list exist? Or do I get something wrong with the concept of OpenID. Is it possible to detract the authentication for specific sites?
You should be able to see this on your Google Account page https://security.google.com/settings/security/permissions