The programmable directional thumb pad can be used either for movement or as modifier keys to access auxiliary commands.

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With an arsenal of tournament-grade controls including 16 fully programmable Hyperesponse keys, eight keymaps that can be switched between on-the-fly, twenty unique gaming profiles, and an eight-way directional thumb pad all integrated into one dedicated gaming keyboard, gamers will be prepared to take on any challenger.

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We didn't have to change our usual or "traditional" finger positioning, meaning we were able to keep our right thumb in the bottom left corner of the pad and use our index finger to navigate. (Even if our thumb moved slightly up on the pad it still worked.) Best of all, while using that finger positioning we rarely zoomed in on something by mistake.

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Or else they pushed a thumb on to the opened ink pad, and left a purple thumbprint like a flower on the bottom of the page.

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Even with touch sensitivity turned off, clicking left or right with a second thumb resting (but not pressing) on the opposite side of the Pad resulted in scrolling the reverse direction.

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The 9900's optical pad is replaced with a camera that lays beneath the glass and senses the movement of your thumb.

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