^not really?
having multiple domains on one account varies from host to host and what they..can offer you.
you can have one domain
registered at one place [for exampl godaddy] and have another
registered through your host, but they can all be on the same account by just setting the DNS servers to point to the webhost/server.
something i got from a webhost-review site..
QUOTE
What are Add-on Domains, Multiple Domains, Domain Alias, Domain Parking, etc.?
You can skip this section if you already understand what these terms mean. Despite the confusing terminology, they all refer to 1 of 2 cases which we will be looking at below.
Now, let’s say you are already hosting "George-Bush.com" with a web host and you also have another domain called "US-President.com".
With domain alias/parking/pointing, US-President.com will be exactly the same as George-Bush.com. Both these domains will point to the SAME website. The alias itself will not contain any new content, it is merely a duplicate of the main site. The feature chart on your left and in our directory is referring to this.
With add-on domains, George-Bush.com and US-President.com will be 2 totally different sites. For example, George-Bush.com might be a site dedicated to George Bush himself while US-President.com can be a site dedicated to all the presidents in the history of the United States. Your web host simply creates a subdirectory in your main account for the add-on domain and the add-on site will share all the resources (diskspace, bandwidth, MySQL...) of your main site. In this way you don't need to pay for another hosting account if you want to host another site.
'Multiple domains' shall refer to add-on domains, but be aware that many web hosts are actually referring to domain pointers. So the phrase 'multiple domains' alone is a misleading one. But since the future of the web hosting would be 'multiple domain hosting', the phrase will slowly evolve to mean add-on domains.