There are various ways to forward website visitors from one domain/website to another. The so-called URL redirection is commonly preferred. In contrast to parking a domain, a URL forwarding is possible only if the domain in question is hosted. What this means essentially is that you can still open any content if you have a direct link to it and you could create e-mail addresses or subdomains and use them. This kind of function has several practical uses - if you choose to switch your domain name, you could redirect the traffic, but the e-mails with the old one will still be active in case you are making contact with customers or partners. When you have 2 identical websites and you would like to rebuild one of them, you may forward the site visitors to the other site so that you can avoid losing potential customers, while you shall still be able to access the administrator area for the first site and work on it.