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