[support] Windows App -> Drupal Login

I have a request to make an icon on for a Windows desktop which would launch a browser (or extra tab I guess) and also log the person in. I am not a Windows programmer (not even a user) but in theory, is this even possible?

This client has Active Directory and he also asked about integrating that. For that, I see there is an ldap-based solution[1] which I think could work. I found http://drupal.org/project/webserver_auth but I don't know how this works precisely. I am just wondering if we could get automatic Windows user authentication into Drupal, then a simple link to their site would log them in.

The server is remote and is Linux, but I think these solutions work on a Linux server.

Any ideas?

Thanks.

[1] http://pasada.org/integrating-drupal-active-directory