In this paper, we study the structure of a general framed vertex operatoralgebra. We show that the structure codes (C,D) of a framed VOA V satisfycertain duality conditions. As a consequence, we prove that every framed VOA isa simple current extension of the associated binary code VOA V_C. This resultwould give a prospect on the classification of framed vertex operator algebras.In addition, the pointwise frame stabilizer of V is studied. We completelydetermine all automorphisms in this pointwise stabilizer, which are of order 1,2 or 4. The 4A-twisted sector and the 4A-twisted orbifold theory of the famousMoonshine VOA are also constructed explicitly. We verify that the top module ofthis twisted sector is of dimension 1 and of weight 3/4 and the VOA obtained by4A-twisted orbifold construction of the moonshine VOA is isomorphic to themoonshine VOA itself.
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