I can\'t get detect.aspx to work. Get a message saying: The type or namespace name \'HDAPI\' could not be found (are you missing a using directive or an assembly reference?) I have tried to do regsvr32 but get an error there as well. Do the DLL\'s need to be registered? This is a windows 2003 web edition server. JOhn

Yes, you need to register the two dlls to your .net website, copy both into bin folder. Try it again.