[OpenID] User and password instead of OpenID URL?

[thomas Armstrong]

Hi.

I create web tools using OpenID for my customers. One of them don't
like it and find it "hard to understand" because it forces users to
type their "OpenID URL" instead of their user and password.

I try to explain it that OpenID is more comfortable for users because
it doesn't require user+passwd every time and you must remember only
one URL.

But all my systems are designed to use OpenID as a SSO. Do you have
any experience switching from OpenID URL to user+pass without removing
the OpenID server?

Thank you very much.