I created another user account on my computer, and visited Ask Different. I logged in using the same username I normally use (and I am using now), but despite I used the same ClaimID OpenID account, it shows me as user6474.
I tried from my other Mac, using the similar user account I have on my Mac Mini, but I am still logged in as user6474.
To show that it's an account to which I have access, I am going to rename the account, and use kiamlaluno also on the new account.
Update: I tried logging in on Stack Overflow from the other computer, and it reports the following message:
This OpenID is new to Stack Overflow:
However, it is know to 1 other sites in the Stack Exchange Network
To try logging in on Stack Overflow, I have used Google Chrome, instead of Safari, and I don't understand why I get that message.
I should not see that message, as I am using the same OpenID account I am using on this computer. I don't understand the reason why SE thinks it's a new account when I use it from a different computer and a different local user account.