Concept of Operation?

I have set up my Home Duo to sync to the Documents folder on my laptop, let’s call it laptop ‘A’. If I log into the Duo using the same credentials but from a different laptop, 'B ', will it now sync to the Documents folder on B? If so, will it delete all the files sync’d from A that are not found on B?

In other words, are the files catalogued by username alone, or by username + machine? And if machine is involved, what aspect of machine identity is used?