     is used commonly in printers, plotters and medical instruments and disk 
      drives.</td>
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    <td><strong>Task Switching </strong></td>
    <td>Use Alt Tab to task switch manually. Operating systems also task switch 
      automatically. For example when word processing, the clock display continues 
      to work because from time to time the operating system switches tasks to 
      keep both going.</td>
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    <td><strong>Thermostat<