If they succeed, the computer will move a cursor up or down a screen placed in front of their eyes.

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The difference with the Tonara app is that it actively listens to musician playing and the cursor follows the performer, even when they speed up, slow down, stop or make a mistake.

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To move the cursor, you swipe in the keyboard area left, right, up or down.

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"When you hover the cursor over the editing changes, the identity of the editor pops up, and it just says 'Merck, '" Curfman says.

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Users can, for example, write or edit a document on one device, put that device to sleep, open the same document on another device, and pick up where they left off, right down to the cursor position.

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Still, the starboard touchpad takes some getting used to -- more than once we found ourselves brushing up against the area below the keyboard, staring in bewilderment at the unmoving cursor on the rig's screen.

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Whenever there's a hiccup in my Metro flow, I have to rack up around a foot (30cm) of total mouse movement to get my cursor over to the Metro panel and put things back on track.

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But I will offer a loud "amen" to my readers' complaints about the new supplemental cursor keys (the grouped arrow keys and the grouped home, end, and page-up keys).

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Only up close can you see that he speaks by using those eye pupils to guide a cursor across an electronic keyboard.

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