displaying & not displaying the www in address bar

Does anyone know how to solve this problem:

In IE when viewing a site if you type in http://google.com IE expands the URL to http://www.google.com.

On some sites the URL is expanded and on some it is not expanded and will stay http://google.com.

How can you make, either by using Apache server, or by customizing IE a site show up as http://... and *not* expand into the http://www....?

Any suggestions?

Thanks.

 

 

 

 

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