Setting new connection over a network

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ASP.NET

Hi guys and girls.
Here's what I need to do. The project I wrote is going to be launched on a network shared by atleast five computers. Now I need to check if the user has previously logged into the application with his specific computer. I know how to do this by checking the registry using "Application.UserAppDataRegistry.GetValue", however the client doesn't want it like that. What he wants is to use the web.config file for this, if that makes any sense. I basically need to open up a form where they can set their connection if they are logging in for the first time on that computer. Hope this makes sense.