...
- USERNAME replace with the username of the web user you use to access the page
- PASSWORD replace with the password of the web user you use to access the page
- HOSTNAME replace with the host name or IP address of the machine running TIM Enterprise
References
This information is available in more detail at the Microsoft Support site:
...
Updates
Microsoft has removed the ability to auto login using regedit. They've patched it :-
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2004/ms04-040
(As with the previous Internet Explorer Cumulative Security Update, MS04-004, this update prevents you from visiting Web sites that have "username:password@host.com" URLs for XMLHTTP. We have created an update to MSXML that addresses this issue specifically for XMLHTTP. For more information, see Microsoft Knowledge Base Article 832414.)
https://support.microsoft.com/kb/834489
en-gb/help/832414/xmlhttp-call-fails-for-urls-with-embedded-user-credentials