Registering a domain and hosting one is often mistaken by a lot of people to be the same thing. They're in reality 2 different services - the domain name registration is the actual name and nothing else, while the hosted domains feature refers to the number of already registered domains that one could accommodate within the same hosting account and have site files and email messages for them. Your sites will work in exactly the same way no matter whether the domain addresses are registered and hosted at the same place or are registered with company A and directed to company B. Simply registering a domain without hosting it will grant you ownership, but will not allow you to have a website until you host this domain in some account so that records for it are created and it starts opening the information from that account.