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A keyguard is a metal or plastic plate placed over the keyboard that allows users to rest their hands on the keyboard without accidentally pressing any keys. Small trackballs that the user controls with a thumb or one finger can be attached to a table, mounted to a wheelchair, or held in the user's hand. Another option for people with limited hand movement is a head-mounted pointer. To simulate the functions of a mouse button, a user works with a foot pedal, hand pad, or pneumatic instrument controlled by puffs of air.
Hearing-impaired users can instruct programs to display words instead of sounds...
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