INT 2F - MDEBUG command driver - END DRIVER                                     
	AX = D112h
Return: DL = FFh
Notes:	only called by the transient part of the driver to inform the resident
	  part that it will be released after this function
	the function must be reentrant and the driver mustn't chain this
	  function to the old INT 2F
SeeAlso: AX=D101h,AX=D111h