Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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32-Bit Overrides
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     On the 80386/486 processors, 32-bit operands can be accessed in a
     16-bit segment and 16-bit operands can be accessed in a 32-bit
     segment using the 66h operand size override prefix. Likewise, 32-bit
     addresses can be accessed in a 16-bit segment and 16-bit addresses
     can be accessed in a 32-bit segment using the 67h address size
     override prefix.
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