Could be a mouse, a trackball or a touchpad.
The mousepad on the computer. Some computers have a mini mousepad between the F+G key.
That's called a trackball. The device stays in place and you move the ball (usually) with your thumb, rather than moving a mouse which in turn moves the ball inside (or with the newer optical mouse, electronically senses the mouse motion).
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It is called a touchpad.
If the ball is on the bottom, it's a "roller ball." If it's on the top and meant to be touched, it's a "trackball."
You cannot change the trackpad out for a trackpad. If you want a trackball you need to get a Blackberry with a trackball such as a Tour 9630 or Curve 8330.
Most laptops already have an alternative for a mouse. Some have a mouse pad or touchpad area. Moving a finger around in the touchpad works the same as moving a mouse. Others have a pointing stick in the keyboard, usually between the G H and B keys. It works like a little joy stick. There will also be some buttons below them that work as mouse buttons. Some alternatives to a mouse include a joy stick and a trackball. A trackball is like an upside down mouse where a ball is moved around by the hand. Some laptops also have touch sensitive screens (like an ipad or android) removing the need for a separate pointing device.
One can buy a Microsoft Trackball from Amazon for about $125. Some of the features include precision trackball design, five buttons and a wheel for scrolling and zooming. The Trackball is a sophisticated mouse for a laptop or a PC.
I was also having some troubles with the trackball on my blackberry and came across this article which was very helpful: http://alboett.blogspot.com/2009/12/blackberry-pearl-how-to-clean-and.html. you out.
AnswerAccording to the web site www.trackballworld.com the trackball was invented in 1949 by two Canadian engineers working on a new radar system. Full reference citation: http://www.trackballworld.com/trackball-history.htmlTom Cranston and Fred Longstaff invented the trackball.
George E. Gerpheide invented the touchpad in 1988