The IOPL (I/O Privilege level) flag is a flag found on all IA-32 compatible x86 CPUs. It occupies bits 12 and 13 in the FLAGS register. In protected mode and long mode, it shows the I/O privilege level of the current program or task. The CPL (Current Privilege Level) (CPL0, CPL1, CPL2, CPL3) of the task or program must be less than or equal to the...
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http://en.wikipedia.org/wiki/IOPL
Input/Output Privilege Level
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http://www.encyclo.co.uk/visitor-contributions.php
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