DynHost record in DNS
OVH.com created name "DynHost". This is name of DNS record. This DNS record have own user & password for remote update. Update was send by HTTP GET to script on the server. Security for this solution is Basic access authentication HTTP.
dyn.com are using the same solution for this.
can you add posibility of adding users and DynHost records to DNS?
Help guide from OVH for DynHost: http://help.ovh.co.uk/DynDns