Boosted setting for Nikon D100?

I have just read an article related to review of Nikon D100. The writer of the article shows several pictures where he actually shot pictures in boosted setting to allow the usage of ISO 3200 and ISO 6400. Can someone tell me how to set the camera to use such ISO. Really wanted to try my Nikon D100 in boosted setting.

All you have to do is look on page 48 at the bottom of the page under H-1 / H-2 settings

If you use Adobe Lightroom 3 in your work-flow, you can reduce the noise caused when using high ISO's If you are a Photoshop user, you can use a plug-in like Noise Ninja to reduce the noise