Function  5Dh   Subfuction  06h Get Critical Error Flag Address
entry   AH      5Dh
	AL      06h 
return  DS:DI   Address of the critical error flag
note 1) Returns the address of the 1-byte critical error flag. A nonzero value 
	indicates a critical error has occurred in the system. When this flag 
	is set, calls to the DOS kernel should be restricted until processing 
	is complete.
Function  5Dh   Subfuction  0Ah Set extended Error Information
entry   AH      5Dh
	AL      0Ah
	DS:DX   Address of extended error information table
returns nothing
note 1) Permits programs to set the extended error information returned by 
	function 59h (Get Extended Error Information). The format of the 
	extended error information table is shown below.
     2) Extended Error Information Table Format.
	Offset Size  Description
	------ ----- ------------------------------------
	  00   Word  Value function 59h will return in AX
	  02   Word  Value function 59h will return in BX
	  04   Word  Value function 59h will return in CX
	  06   Word  Value function 59h will return in DX
	  08   Word  Value function 59h will return in SI
	  0A   Word  Value function 59h will return in DI
	  0C   Word  Value function 59h will return in DS
	  0E   Word  Value function 59h will return in ES
	  10   Word  Always 0
	  12   Word  Always 0
	  14   Word  Always 0