Makes it easy to run your own "DynDNS" service with Simple DNS plus (just like dyndns.com, no-ip.com, tzo.com, etc.).
Besides from running a public DynDNS service, there are many possible uses for this. For example making it easy to connect with company road warriors, branch offices, etc.
A DynDNS service makes it possible to connect, using a static host name, to any kind of service including web-server, mail-server, remote desktop, VPN, etc. running on a computer with a dynamic Internet IP address.