I know I could use MAC address, but then I have to go to the trouble to enumerate all the MAC addresses and allow the user to decide which to use and store that. Is there another ID one can pull off a given PC that is accurate 99%+ of the time? If 1% of the time they have to call, that is OK. I am going to write a web service that handles the activation and key to PC management.

In our VFP applications we get a value based on the serial number of the hard drive and it has worked for 10 years in some applications, they just have to call when they get a new drive or PC.

Any thoughts on a "better" way in .NET short of MAC?

Keith Chisarik