[Samba] security = domain / security = server

[Nir Livni]

I understand that the difference between "server" and "domain" mode is that
in "domain" mode"Samba fully uses the domain capabilities. He behaves like
another NT Server or Windows 9x do by participating in domain trust
relationships."

Could someone please explain me
1. What is it exaclty that "domain" mode does, that "server" mode doesn't
2. What is it exaclty that "server" mode does, that "domain" mode doesn't

Thanks!