INT 21 OU - DR DOS 5.0-6.0 - HISTORY BUFFER, SHARE, AND HILOAD CONTROL          
	AX = 4416h to 4418h
Note:	these obsolete subfunctions (which are no longer supported in Novell
	  DOS 7) are identical to AX=4456h through 4458h
SeeAlso: AX=4456h,AX=4457h,AX=4458h