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Trackball - YouTube
What is a Trackball? - Trackball Mouse Reviews
What is a trackball? - Quora
ICT knowledge - Track Ball example of input device Track ball is an input device that is mostly used in notebook or laptop computer, instead of a mouse. This is a ball
Finding, Installing, and Using a Trackball :: Chapter 21. Working with Input Devices :: Part IV: Mac OS X: Expanding Your System :: Using MAC OS X v10.2 :: Mac OS :: eTutorials.org