On 07/06/2011 03:06 AM, g wrote: <> > there are ir leds emitting at surface of balls and ir detectors receiving > reflections from ball surface. in addition, there are some trackball mice that use a roller bar, ie, like a standard mouse. i do not recommend them. they do not track well. you will also find 'palm ball' types, but they are not as convent to use as a 'thumb ball'. i had one and gave it away. -- peace out. tc.hago, g .
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