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The icons are generally activated by an on-screen pointer controlled by a mouse or trackball.
Two large buttons sit on either side of the trackball and replicate the left and right mouse buttons.
The idea was to grasp the stick in the palm of the hand and manipulate the trackball with the thumb.
Since this mouse is an optical mouse, the mouse fails when sufficient sunlight leaks into the trackball.
For each image, the perimeters of the right ventricular cavity were traced using an off-line trackball algorithm.
Efficient controls, those with a high ratio of degrees of freedom to selection overhead, are: touchpads, trackball; spaceball; motion-tracking glove.
However, when used outdoors in bright sunlight, we often had to shade the trackball with the user's second hand in order for it to function properly.
Together with light pens and trackballs, it was offered as optional input device for their system since 1968.
The cursor pointing function was handled by a built-in trackball that could be removed and located on either side of the keyboard.
The combination of the trackball accuracy and joystick analog control allowed for sophisticated two-hand aiming, arguably unsurpassed to these days.
This variant of the mouse resembled an inverted trackball and became the predominant form used with personal computers throughout the 1980s and 1990s.
Its trackball system exhibited issues with wear under high use, and without maintenance most specimens eventually broke down.
The majority of the displays are screens, with a trackball to choose to play a video on a certain topic.
The trackball broke down due to the body oils from his hands.
This button is duplicated on either side of the trackball for left or right-handed players.
It employed the same twin trackballs with an action button duplicated on either side and a similar cocktail cabinet design with horizontal screen.
He works, creates art, and communicates via the computer by using his thumb on a trackball mouse.
Less common setups include devices such as trackballs or steering wheels.
