There are typically three parts to a Web site name. The first two parts, going right to left, form the domain name, in this case "bchydro.com". That's what BC Hydro owns through registration.

Once you own the domain name, you're free to set up as many "hosts" as you want, and to give each one a unique name in the third (left) position. It's like subdividing real estate. By longstanding convention, Web sites are given the name "www" for World Wide Web (e.g. "www.bchydro.com"), though there's no law that says it has to be "www". There can be other kinds of sites than Web sites; for example, a mail server might be at "mail.bchydro.com" and a file transfer site might be at "ftp.bchydro.com".

A given domain can have multiple Web sites, and in this case "wwe5" is just another name for a Web site. It can be anything. In the recent Web site testing project, I set up a test Web site at "test.msmphotography.com", and it was completely independent of the main site at "www.msmphotography.com".

Does that explain it?