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Description: Operand 1 selects which invocation flags are to be set. Only the invocation flags that are "writeable" can be set. Any "read-only" flags selected by the stack value are unchanged. The operation is performed by doing a bit-wise Boolean or of the 16 writeable status bits with the low-order two bytes of the set mask operand, and then replacing the writeable status bits with the result of this or.