>How does it work? I am logging on to an AS400 not NT. I can provide default parameters for the connection string, but to be able to track individual jobs by user, I need the users personal information.
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>I want to prompt the client machine for their AS400 userid and password and pass this information to my .dll on the web server.
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>Will this Challenge/Response do what I want it to do?

Why not just use an ASP page to get the client's username and password? From there, you can instantiate objects in your DLL and work with them, so you can pass the form fields (username and password) through variables and work with them with your DLL (this is assuming you are using your DLL for your web site).

Regards,

Hugo