What I need to know — have needed to know for 25 years, actually — is, how do you log into a Samba share when none of the user accounts on the server have a password in the first place? What credentials is Samba looking for in that case?

What I need to know -- have needed to know for 25 years, actually -- is, how do you log into a Samba share when none of the user accounts on the server have a password in the first place? What credentials is Samba looking for in that case?