“Hey, witch doctor, give us the magic words!”
One of my servers has an SSL certificate from GoDaddy. More specifically, this is a Unified Communications Certificate (UCC), so it can have up to 5 domain names. I originally registered 3 names, and I recently needed to add a 4th. The good news is that GoDaddy let you specify extra names through their web interface and download the new certificate without charging any extra money. The bad news is that they don’t provide any documentation on installing the new certificate.