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INT 2F - Multiplex - DOS 4.0 APPEND - GET APPEND FUNCTION STATE
        AX = B706h
Return: BX = APPEND state
            bit 0: set if APPEND enabled
            bits 1-12 reserved
            bit 13: set if /PATH flag active
            bit 14: set if /E flag active (environment var APPEND exists)
            bit 15: set if /X flag active