It is important to access the almacha.org servers with the right hostname, even if different hostnames currently point to the same IP address, because the hostname must match the SSL certificates CN and because some names can be changed. For example, if the Web server is changed to leopard.almacha.org, then www.almacha.org will change but dauphin.almacha.org will be kept the same.
This names point to real physical machines, so they will change only when machine change of IP address (if this ever happens), but the physical machine they point to will always be the same. So you should use this hostnames for:
This name points to the Web server and can change when the machine that is used as Web server is changed. So use this hostname for: