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  Trackball

Sigma KEE - Trackball
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Trackball
A type of ComputerInputDevice with a ball that can be rolled to control a cursor in the X and Y directions. A Trackball may or may not have an attached button for clicking.
Relationships      
Parents ComputerInputDevice A peripheral device that generates input for the computer such as a keyboard, scanner, or mouse.


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Sigma version 3.0 is open source software produced by Articulate Software and its partners