General Dynamics Itronix GoBook MR-1 Getting Started Manual page 13

Micro Joystick
The small mouse touchstick (see previous image for location) controls the
mouse on the screen. Using your finger or thumb move the rubber joystick
in the direction you want the mouse to move.
Zoom Key
The GoBook MR-1 keyboard has a special Zoom key (see image below) for
enlarging the currently active screen item.
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