URL showing backlinks of 2nd URL - how?

[wanderer]

Can anyone enlighten me as to how this is being done? Two URL's, both with the same content, showing the same backlinks and PR on the toolbar. No redirection from one URL to the other. Backlinks to second site actually contain the first's URL - how are they doing this?

www.pvdd.com
backlinks:
http://www.google.com/search?sourcei...Epvdd%2Ecom%2F

www.pleasant.ca
backlinks:
http://www.google.com/search?sourcei...easant%2Eca%2F

The reason I'm interested is because the site is hosted in the US. The benefit to what they've done is that the .ca domain is well-placed in the Canada only Google results. It ranks well in those results because it shares the PR which is actually attributable to the .com.

Seems like a very neat & clean way to have a new .ca share or benefit from the work that has gone into an established .com, which is hosted in the US and therefore won't appear in Canada only results. No splitting of PR & links between two domains. Means one doesn't have to talk the client into moving their content to a .ca and redirecting the .com, or changing their host from a US provider to a Canadian one.

I'd really like to know how this can be done, if anyone knows. Also if this is considered by the SE's to be a form of spam and therefore risky.

I found this information. Sounds like it might be the trick, though I can't tell if this applicable to Apache - beyond my scope of knowledge.

I posted this in another forum and received the answer that the site was using a redirect.

But my question is this. Is this redirecting? When url A is permanently redirected to url B, doesn't typing url A in the browser address bar result in url B replacing url A in the address bar when the redirect takes place? In the case of a permanent redirect, wouldn't a check of backlinks on url A show as 0 if all of the links are to url B? This is not what is happening in this particular case.

Appreciate it if someone here could clarify this for me. Thanks.

P.S. This post may look familiar as I posted same elsewhere as well in the hope of getting a quick, clear answer asap.