Int 21 Fn 44  U - Dr-dos 5.0 - History Buffer, Share, And Hiload Control   [O]

   AH = 44h
   AL = 16h to 18h

Note:  these obsolete subfunctions (which will not be supported in future
     versions of DR-DOS) are identical to AX=4456h through 4458h

See Also: AX=4456h,AX=4457h,AX=4458h