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There are three touch sensitive areas under the display for Home, Start, and Search. You can also see one of the two openings here (grill in silver) for the stereo speaker system.
There is HTC and T-Mobile branding along the top, along with the other stereo speaker opening.
The HTC Surround and HD7 are the two first US HTC Windows Phone 7 devices and as you can see there is quite a difference in screen size.