INT 16 - pcANYWHERE III - CHECK STATUS
        AH = 79h
Return: AX = status
            FFFFh if resident and active
            FFFEh if resident but not active
            FFFDh if in Memory Resident mode
            FFFCh if in Automatic mode
            other value if not resident
SeeAlso: INT 21/AX=2B44h