Int 21 Fn 4457  U - Dr-dos 5.0+ - Share/hiload Control                     [O]

   AX = 4457h
   DH = subfunction
       00h enable/disable SHARE
       DL = 00h disable
          = 01h enable

          else Return: AX = ???
       01h get HILOAD status

       Return: AX = status
               0000h off
               0001h on
       02h set HILOAD status
       DL = new state (00h off, 01h on)

       Return: AX = ???
       other

       Return: AX = ???

Note:  This was seen called by COMMAND.COM of DR-DOS 6.0

See Also: AX=4457h/DX=FFFFh