Int 21 Fn 0B56  - Virus - "perfume" - Installation Check                   [v]

   AX = 0B56h

Return: AX = 4952h if resident

See Also: AX=0D20h,INT 12/AX=4350h/BX=4920h,INT 13/AH=F2h,INT 21/AX=010Fh