NXC  Version 1.2.1 r5
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#define PowerField   2

Power field.

Contains the desired power level (-100 to 100). Read/write. Specify the power level of the output. The absolute value of PowerField is a percentage of the full power of the motor. The sign of PowerField controls the rotation direction. Positive values tell the firmware to turn the motor forward, while negative values turn the motor backward. Use UF_UPDATE_SPEED with UpdateFlagsField to commit changes to this field.