“what I meant was how does a browser know to open up either”
There is a hierarchy that a browser looks for. I’m not certain what it is but it is something like this:
default.htm
default.html
index.htm
index.html
etc.
If you type in http://www.site.com first it looks for a site.com/default.htm file; then if there isn’t one, a default.html; etc., until it finds the “highest” in the heirarchy that is on the server.
On the other hand, I’ve seen sites that have both default.htm and index.html and this just confuses the bots. I’ve seen Google caches that are the same for those two files, even though they did have completely different content. In the case I’m thinking of the index.html file was a webhost placeholder that was never deleted off the server.
Anyway, personally I make it a priority to be sure that my default/root/index page is totally clear with no possible way to misinterpret it. In your case blackhawk, you do have two PR’s for whatever reason for your “main” page, so minimally that is a sign that you could likely improve your sites rankings, and avoid troubles, by fixing the cause of that problem, whatever it is.