Int 21 Fn F1E9  - Virus - "tremor" - Installation Check                    [v]

   AX = F1E9h

Return: AX = installation state
       CADEh installed, and calling program is infected
       F100h not installed (normal DOS return value)
       else  installed, but calling program is not infected

See Also: AH=F1h"VIRUS",AX=F2AAh