HKLM\Enum\Root\Net\000n\Bindings points to the HKLM\Enum\Network\MSTCP\000n key which has a value string, "Driver" which points to the appropriate HKLM\System\CurrentControlSet\Services\Class\NetTrans\000n where the IPcfg values are stored for Dial-Up Adapters. I guess I can use a process of elimination to identify the "NIC" entries.

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My opinions are my own -- assuming I have any...