INT 21 - European MS-DOS 4.0 - HARD ERROR PROCESSING                            
	AH = 95h
	AL = new state
	   00h enabled
	   01h disabled, automatically fail hard errors
Return: AX = previous setting
Desc:	specify whether hard (critical) errors should automatically fail the
	  system call or invoke an INT 24
SeeAlso: INT 24,INT 21/AH=59h/BX=0001h