The usernames and passwords for the users that will be using our DNN 4.0 portal will be the same as their login credentials to the network. (XP clients and 2000/20003 servers using AD). One of the requirements for this project is single signon, meaning that if the person in logged into their machine on the domain, those credentials need to be passed in automatically into DNN and the user be logged in. (Do not worry about how the usernames and passwords are syncronized to DNN, that logic has already been put in place.)

I need to understand how I can pass the credentials directly to DNN and log the user in automatically. If this cannot be done via settings, can someone point me in the correct direction as to where to look in the code.

Thanks for the help!