Auto Login to Web Application

Hi,

 

i have web application which has to login automatically based on the used already logged-in to windows system.

 

As of now i was storing the user credentials into data base and doing the authentication.

Now i got requirement to host this application across multiple domains and users don't want to login every time as they already logged-in to their system.

 

Please help me with code if you have anything.

 

Thanks in advance.

 

Regards,

Balakrishna Reddy. C