You can't get the MAC address of the client. You can get its IP, which is sufficient most of the time. I believe you're looking for solving a scenario where a proxy is involved, which routes requests from many clients. If this is the case, recall that with respect to the ASP.NET application (the server) there's only one client, the proxy server. As for calling an exe, read my other answers to that topic on this page. (or search google for "System.Diagnostics.Process Cazzulino" ;))
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