An addon domain is used to add multiple domain names to your hosting account each of which can point to a different folder (subdomain) and display different content. This allows you to host multiple separate websites under one hosting account.
A domain alias is used to make your website content available from additional domain names. For example if you own multiple versions of your domain name such as .co.uk and .com.
A subdomain can be used to create a subsection of your website based on the existing domain name - for example members.yourdomainname.com.
There is no set limit. You can attach multiple domain names, either linking to the same site, or to multiple sites.
We have 4 different servers. Your 'Welcome Email' will detail the correct nameservers to use - but we can also confirm this for you.
If we are your domain provider, we will normally link it for you.
Spectulise server 1
Spectulise server 2
Spectulise server 3
Spectulise server 4