Int 2F Fn D3D3  - Kdrive V2.x - Installation Check                         [K]

   AX = D3D3h
   BH = 00h

Return: BX = 3D3Dh if installed
   CF clear if installed
       AX = driver ID??? (returns 0087h for KDRIVE.EXE and 0880h for
         KDRIVOS2.EXE in one examined version)
Program: KDRIVE is a shareware extended German keyboard driver by Martin
     Austermeier, originally based on K3 by Martin Gerdes as published
     in c't magazine 7/1988