@BK2000 interesting. IRS measures the five returns per machine by using a similar devise ---- I am surprised because the MAC address of your NIC etc., are each unique and after you remove all the encapsulation of the messages , ultimately points to the interface adapter. I am assuming that you used cmd. ( ipconfig /all compartments /all ) to get all the details. Each of the adapters should have an unique 12 digit ( HEX ) MAC address.
What would explain your situation would be for TurboTax to use your TurboTax account as the unique use identifier. That would be a cheap trick to play when saying five installations. I apologize for my mistake.
