I have not tried this. But I guess this is like the one to adjust the screen in most of the monitors. 
might be just to scholl up the windows. 

I am not sure if this is used by any one any more . 

if u need a sample code send me a mail 


INT 10 - VIDEO - SCROLL UP WINDOW
	AH = 06h
	AL = number of lines by which to scroll up (00h = clear entire window)
	BH = attribute used to write blank lines at bottom of window
	CH,CL = row,column of window's upper left corner
	DH,DL = row,column of window's lower right corner
Note:	affects only the currently active page (see AH=05h)
BUGS:	some implementations (including the original IBM PC) have a bug which
	  destroys BP
	the Trident TVGA8900CL (BIOS dated 9/8/92) clears DS to 0000h when
	  scrolling in an SVGA mode (800x600 or higher)
SeeAlso: AH=07h,AH=72h,AH=73h,AX=7F07h,INT 50/AX=0014h