How do you log in as different user in OWA when already logged in to the domain?

When I point a browser to my OWA it automatically logs me in as the currently logged in domain user. How can I log into MY outlook on OWA on someone else's PC?
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http://<exchange server/exchange/<usermailbox>
This will prompt you for user name and password.
You can use any user account as long as it has Domain Admin right, and access to the users mailbox.

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How to manage Outlook Web Access features in Exchange Server 2003

Basic Authentication Box Is Displayed When You Log on to OWA

Following is an extract from the above KB article

When you use integrated Windows authentication, you are not initially prompted for a user name and password. This behavior is different from Basic authentication. The current Windows user information on the client computer is used for the integrated Windows authentication.
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