The Viva's core operating system is Windows Mobile 6.1 Professional, but, as usual with HTC handhelds, this lurks beneath the TouchFLO interface. TouchFLO comprises a series of screens you can sweep with a finger to access information. For example, when viewing photos you can sweep vertically to move though on-screen thumbnails, tap to choose one for full screen rendering, and then sweep again to see a slideshow.
The slightly recessed screen bucks the trend for flush-fitting displays, but this doesn't hamper the ability to work with TouchFLO. Indeed, HTC appears to have done some work on its sweep-and-swipe interface, which seems more responsive than we've found it in the past.
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