Twitter rate limit

I am whitelisted in Twitter, and I have this "traffic heavy" application that just makes 2 request to find out how many users 2 people have.... the traffic currently is killing the 150 request limit per hour.

How do I authenticate my requests so that twitter knows I am whitelisted?

http://api.twitter.com/1/users/show.xml?screen_name=chavezcandanga

http://api.twitter.com/1/users/show.xml?screen_name=luischataing

I wish to authenticate those for this开发者_StackOverflow社区 simple project http://250mil.com

Thanks!

See how to authenticate on the Twitter API Documentation, it explains every method available to authenticate and how to issue such authentication requests.