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    <td><strong>Explorer </strong></td>
    <td>See File Manager</td>
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    <td><strong>Extension </strong></td>
    <td>The MS DOS file extension is zero or more characters after the dot in 
      the file name. Word processor files often have .DOC on the end. Assembly 
      code files end in .ASM</td>
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    <td><strong>F1 Key </strong></td>
    <td>Commonly this accesses the on line help.</td>
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