Back to Single Sign-On again. Today, we are not talking about Serena Single Sign-On so much, but having the user automatically authenticated using the user credentials logged on to the workstation. I refer to this as auto-logon using Kerberos or NTLM credentials of the workstation user.
The browser needs to be capable of auto-logon using the WWW-Authenticate header; it is the browser that makes auto-logon possible. Chrome has this ability built in, and you can specify sites to do this auto-logon in Firefox. Neither Firefox nor Chrome use the Security Zones that Internet Explorer uses.