diff --git a/kernel/trunk/docs/sysfuncr.txt b/kernel/trunk/docs/sysfuncr.txt
index c78499fcde..e0e3b36fc9 100644
--- a/kernel/trunk/docs/sysfuncr.txt
+++ b/kernel/trunk/docs/sysfuncr.txt
@@ -635,6 +635,22 @@
     функцию сразу после получения события:
              5 = завершилась перерисовка фона рабочего стола
 
+======================================================================
+====================== Функция 15, подфункция 9 ======================
+=============== Перерисовать прямоугольную часть фона. ===============
+======================================================================
+Параметры:
+  * eax = 15 - номер функции
+  * ebx = 9 - номер подфункции
+  * ecx = [left]*65536 + [right]
+  * edx = [top]*65536 + [bottom]
+Возвращаемое значение:
+  * функция не возвращает значения
+Замечания:
+  * (left,top) - координаты левого верхнего угла,
+    (right,bottom) - координаты правого нижнего.
+  * Если параметры установлены некорректно - фон не перерисовывается.
+
 ======================================================================
 ============= Функция 16 - сохранить рамдиск на дискету. =============
 ======================================================================
diff --git a/kernel/trunk/docs/sysfuncs.txt b/kernel/trunk/docs/sysfuncs.txt
index f2b120e095..3ff25d548a 100644
--- a/kernel/trunk/docs/sysfuncs.txt
+++ b/kernel/trunk/docs/sysfuncs.txt
@@ -629,6 +629,22 @@ Remarks:
     immediately after the event:
              5 = kernel finished redrawing of the desktop background
 
+======================================================================
+===================== Function 15, subfunction 9 =====================
+============= Redraws a rectangular part of the background ===========
+======================================================================
+Parameters:
+  * eax = 15 - function number
+  * ebx = 9 - subfunction number
+  * ecx = [left]*65536 + [right]
+  * edx = [top]*65536 + [bottom]
+Returned value:
+  * function does not return value
+Remarks:
+  * (left,top) are coordinates of the left upper corner,
+    (right,bottom) are coordinates of the right lower one.
+  * If parameters are set incorrectly then background is not redrawn.
+
 ======================================================================
 =============== Function 16 - save ramdisk on a floppy. ==============
 ======================================================================
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index 226592e2e0..7b2fddd23f 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -2425,10 +2425,9 @@ sys_background:
         cmp     ebx, 1                     ; BACKGROUND SIZE
         jnz     nosb1
         test    ecx, ecx
-;    cmp   ecx,0
         jz      sbgrr
+
         test    edx, edx
-;    cmp   edx,0
         jz      sbgrr
 ;--------------------------------------
 align 4
@@ -2698,6 +2697,49 @@ nosb7:
 ;------------------------------------------------------------------------------
 align 4
 nosb8:
+        cmp     ebx, 9
+        jnz     nosb9
+; ecx = [left]*65536 + [right]
+; edx = [top]*65536 + [bottom]
+        mov     eax, [Screen_Max_X]
+        mov     ebx, [Screen_Max_Y]
+; check [right]
+        cmp     cx, ax
+        ja      .exit
+; check [left]
+        ror     ecx, 16
+        cmp     cx, ax
+        ja      .exit
+; check [bottom]
+        cmp     dx, bx
+        ja      .exit
+; check [top]
+        ror     edx, 16
+        cmp     dx, bx
+        ja      .exit
+
+        movzx   eax, cx  ; [left]
+        movzx   ebx, dx  ; [top]
+
+        shr     ecx, 16 ; [right]
+        shr     edx, 16 ; [bottom]
+
+        mov     [background_defined], 1
+
+        mov     [draw_data+32 + RECT.left], eax
+        mov     [draw_data+32 + RECT.top], ebx
+
+        mov     [draw_data+32 + RECT.right], ecx
+        mov     [draw_data+32 + RECT.bottom], edx
+
+        inc     byte[REDRAW_BACKGROUND]
+;--------------------------------------
+align 4
+.exit:
+        ret
+;------------------------------------------------------------------------------
+align 4
+nosb9:
         ret
 ;------------------------------------------------------------------------------
 align 4