> One site keeps trying to offer me Windows toolbars, so they obviously
> aren't geared to using the information effectively.
> 
> On the other hadn www.cbc.ca can tell that I am not in Canada.

This is not related.

Browser version is sent from the browser data in the GET request.

IP location is inferred from source IP and looked up in a geolocation
database (purchased by the site vendor).

Changing your browser id string is trivial and purely client side.  
Changing your IP location is not.

-m


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