HTC HD2 Mode D'Emploi

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  Chapter 1  Getting Started
On certain screens wherein some onscreen controls or icons appear 
small and hard to tap on, you can also use pinch zooming to zoom 
in and out. After zooming in, the onscreen control or icon becomes 
larger and you can easily tap it with your finger. You will also see 
a small preview window, and you can drag your finger around this 
window to pan around the zoomed screen.
Normal screen
Zoomed screen