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In page Trackball:
"Large trackballs are common on CAD workstations for easy precision.[citation needed] Before the advent of the touchpad, small trackballs were common on portable computers (such as the BlackBerry Tour) where there may be no desk space on which to run a mouse. Some small "thumballs" are designed to clip onto the side of the keyboard and have integral buttons with the same function as mouse buttons.[2]
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