How would that work with, for example a single deamon supporting multiple (different) remote users - for example ftpd, or sshd? (I imagine you could say that s

How would that work with, for example a single deamon supporting multiple (different) remote users - for example ftpd, or sshd? (I imagine you could say that sshd forks for each user, but some of the legacy systems like ftpd/ircd wouldn't have that as an option..)