Int 2F Fn D111  - Mdebug Command Driver - Start Driver                     [G]

   AX = D111h

Return: DL = FFh

Notes: only called by the transient part of the driver to inform the resident
     part that it is installed
   the function must be reentrant and the driver mustn't chain this
     function to the old INT 2F

See Also: AX=D101h,AX=D112h