I have my site surfimages.com live for about 4 years now. I have owned surfingprints.com and surfimages.co.uk, and have now had my hosting company place them as root domains. So in the address bar if you were to type in: surfingprints.com it would take you there, but have the same content as surfimages.com What is this called, and is this perfectally fine, as I am not trying to cheat the system. Thanks, Jack
301 redirect most likely. It is also called Domain Masking in some cases. Depends on how they set it up. It can be 302 redirect as well.
You should be able to do this in your Domain Control Center whatever company you use to register domains. Or you can setup 301 redirect using .htaccess if you have some skills
You are using a domain forward or a redirect. That is perfectly normal. It is implemented by the web host using an option in the domain control panel.