@DBCountMan It knows nothing of GUIDs as we don’t have a nice way to know what is what and in a consistently generatable method (believe me when I say we went down that Path and while we made some progress it wasn’t exactly feasible and has since more or less fallen off the radar.)
We use the device’s mac address’ to determine which host is attempting.
So if the primary device’s name is ME and the mac is 00:00:00:00:00:00, and you add a device with mac address 00:00:00:00:00:01, it will send both macs and lookup the device. ME will be found and 01 ending will be associated as pending mac to the device.