Question
a.
They can be tiring to use on upright displays and are harder to take up and put down when used together with a keyboard. They can also easily get lost, and the act of pointing can obscure the display.
b.
They are not suitable for use in hostile environments.
c.
They are slow and require separate hardware which can be damaged by dirt.
d.
They require the screen to be within about a meter of the user to enable it to be reached.
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