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<td><font face="Times">These functions have nothing to do with main memory; they work only for the 64 kilobytes of I/O address space on an Intel-based computer. These functions use the special machine instructions that are necessary for reading and writing data from and to the I/O space.</font>

<p><font face="Helvetica"><b>Note:</b></font>&nbsp; <font face="Times">These functions work only at kernel level and only on Intel-based computers.</font></td></tr>

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