Dude,
Yes it is very much possible that two different pages can exist in [http://www.bhuiyanbe.com] and [http://bhiyanbe.com]
The reason is because, theoretically, [http://www.somedomain.com] and [http://somedomain.com] can have two completely different IP addresses. It's just like the idea of subdomains. Sure you have seen urls like [http://my.domain.com,] right? So is it not different from [http://mydomain.com?] If the host has subdomain enable it is also possible that one owner owns [http://bhuiyan.com] and another owner owns [http://www.bhuiyan.com.]
The reason you have never noticed it before is because it confuses people so webmasters don't like to use the two as seperate things. If you check out how DNS works they are very different things, like two different numbers on the same street.
And it is also a bad idea to have two seperate places where people link to, because it bleeds your google page ranking. All the backlinks should direct
to one main page: [http://www.bhuiyanbe.com/] I will have to be careful on that in future.
Nice catch, btw.
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This is something I could not have found out myself at all. I always thought they were the same thing. Although, I do not know anything about how DNS works. But I think I understand what you are trying to say.