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This question is as much about reasons as it is about actual devices.

For example a. could be a keyboard and monitor (1 input ,1 output) and these are used at the nursing stations but are difficult to clean for use in the ward.

For ward use a touch screen system that can be readily sterilized is much preferable. This is both input and output.

A more specialized use in hospitals is body sensors (need to be specially electrically isolated) and warning alarms (need to pierce through a busy ward).

For the animated film studio two reasons might be artwork production and motion capture.

Similarly, with the school look at the reasons for input and output.

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