The Thunderstone ISAPI Proxy Module is an IIS add-on that allows you
to proxy requests through another machine.
Users' search requests are not made directly to the Search Appliance, but to
the Proxy Module, which then passes the request along to
the Search Appliance.
The Proxy Module also has an optional AuthProxy, which allows the use
of automatic Active Directory credentials when authenticating
the Search Appliance search results. Internet Explorer will be configured to
automatically pass along the authentication information, allowing for
Single Sign On. The Search Appliance communicates with the Proxy Module to
authorize the results.