2.1.1852 Part 4 Section 7.1.2.80, opEmu (Operator Emulator)
a. The standard does not specify the default value for opEmu.
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In Word, the default value for opEmu is off.
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This note applies to the following products: 2007, 2007 SP1, 2007 SP2.
b. The standard says when opEmu is on, the box behaves as an operator, but does not specify what kind of operator.
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In Word when opEmu is on, the box behaves as a binary operator.