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Required:

• A webserver with a scripting language
• A dumb client which a browser or browser emulation (like lynx or curl)

On the server side you need a little script, plus the "dns-update.pl" from this posting plus the Bind key for the zone you want to update. Here is the script, let's say the name is "update-zone.php":

<?php

if ($_GET['key'] == 'cryptic_key') {
    system("/srv/www/updates.domain/dns-update.pl /srv/www/updates.domain/entry1-transfer.key entry1.updates.domain " . $_SERVER['REMOTE_ADDR']);
}

?>

The "cryptic_key" should be a random value, it's only required to identify the client. Then the "dns-update.pl" script is executed with the Bind key, the hostname which should be updated and the IP address of the client. Note: if you want the client to supply it's name as well (the second parameter), make sure you sanitize the input.

Now all the client has to do is open a website from time to time:

lynx -source -dump 'http://<webserver>/update-zone.php?key=cryptic_key'

It's a good idea to protect the website with https as well.