diff --git a/kernel/trunk/docs/sysfuncr.txt b/kernel/trunk/docs/sysfuncr.txt
index 2767c639b1..c3ca4f5c84 100644
--- a/kernel/trunk/docs/sysfuncr.txt
+++ b/kernel/trunk/docs/sysfuncr.txt
@@ -1108,6 +1108,18 @@ dd 1675
   * Восстановление окна с одновременной активизацией осуществляется
     подфункции 3 (принимающей номер слота).
 
+======================================================================
+======= Функция 18, подфункция 23 - минимизировать все окна. =========
+======================================================================
+Параметры:
+  * eax = 18 - номер функции
+  * ebx = 23 - номер подфункции
+Возвращаемое значение:
+  * eax = 0 - все окна были минимизированы до вызова функции
+  * eax = N - количество окон свернутых функцией
+Замечания:
+  * Окна спец. потоков (имя начинается с символа @) не сворачиваются.
+
 ======================================================================
 ==================== Функция 20 - интерфейс MIDI. ====================
 ======================================================================
diff --git a/kernel/trunk/docs/sysfuncs.txt b/kernel/trunk/docs/sysfuncs.txt
index 69456c2431..804a2a6012 100644
--- a/kernel/trunk/docs/sysfuncs.txt
+++ b/kernel/trunk/docs/sysfuncs.txt
@@ -1108,6 +1108,18 @@ Remarks:
   * One can restore and activate window simultaneously with
     subfunction 3 (which requires slot number).
 
+======================================================================
+======== Function 18, subfunction 23 - minimize all windows. ==========
+======================================================================
+Parameters:
+  * eax = 18 - function number
+  * ebx = 23 - subfunction number
+Returned value:
+  * eax = 0 - all windows have been minimized before a function call
+  * eax = N - number of windows minimized from function
+Remarks:
+  * Window of special thread (name begin to symbol @) is not minimize.
+	
 ======================================================================
 ==================== Function 20 - MIDI interface. ===================
 ======================================================================
diff --git a/kernel/trunk/gui/window.inc b/kernel/trunk/gui/window.inc
index 51d30ad677..f9ad6e846d 100644
--- a/kernel/trunk/gui/window.inc
+++ b/kernel/trunk/gui/window.inc
@@ -1026,6 +1026,55 @@ align 4
 ;------------------------------------------------------------------------------
 align 4
 ;------------------------------------------------------------------------------
+minimize_all_window:
+        push    ebx ecx edx esi edi
+        pushfd
+        cli
+        xor     edx, edx
+        mov     eax, 2  ; we do not minimize the kernel thread N1
+        mov     ebx, [TASK_COUNT]
+;--------------------------------------
+align 4
+.loop:
+        movzx   edi, word[WIN_POS + eax * 2]
+        shl     edi, 5
+; it is a unused slot?
+        cmp     dword [edi+CURRENT_TASK+TASKDATA.state], 9
+        je      @f
+; it is a hidden thread?
+        lea     esi, [edi*8+SLOT_BASE+APPDATA.app_name]
+        cmp     [esi], byte '@'
+        je      @f
+; is it already minimized?
+        test    [edi + window_data+WDATA.fl_wstate], WSTATE_MINIMIZED
+        jnz     @f
+; no it's not, let's do that
+        or      [edi + window_data+WDATA.fl_wstate], WSTATE_MINIMIZED
+        inc     edx
+;--------------------------------------
+align 4
+@@:
+        inc     eax
+        cmp     eax, ebx
+        jbe     .loop
+; If nothing has changed
+        test    edx, edx
+        jz      @f
+
+        push    edx
+        call    syscall_display_settings._.calculate_whole_screen
+        call    syscall_display_settings._.redraw_whole_screen
+        pop     edx
+;--------------------------------------
+align 4
+@@:
+        mov     eax, edx
+        popfd
+        pop     edi esi edx ecx ebx
+        ret
+;------------------------------------------------------------------------------
+align 4
+;------------------------------------------------------------------------------
 minimize_window: ;/////////////////////////////////////////////////////////////
 ;------------------------------------------------------------------------------
 ;> eax = window number on screen
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index a808427f8c..5af852a9de 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -2054,6 +2054,7 @@ sys_system_table:
         dd      sysfn_meminfo           ; 20 = get extended memory info
         dd      sysfn_pid_to_slot       ; 21 = get slot number for pid
         dd      sysfn_min_rest_window   ; 22 = minimize and restore any window
+        dd      sysfn_min_windows       ; 23 = minimize all windows
 sysfn_num = ($ - sys_system_table)/4
 endg
 ;------------------------------------------------------------------------------
@@ -2359,20 +2360,19 @@ sysfn_getfreemem:
         shl     eax, 2
         mov     [esp+32], eax
         ret
-
+;------------------------------------------------------------------------------
 sysfn_getallmem:
         mov     eax, [MEM_AMOUNT]
         shr     eax, 10
         mov     [esp+32], eax
         ret
-
-; // Alver, 2007-22-08 // {
+;------------------------------------------------------------------------------
 sysfn_pid_to_slot:
         mov     eax, ecx
         call    pid_to_slot
         mov     [esp+32], eax
         ret
-
+;------------------------------------------------------------------------------
 sysfn_min_rest_window:
         pushad
         mov     eax, edx ; ebx - operating
@@ -2403,12 +2403,15 @@ sysfn_min_rest_window:
         dec     eax
         mov     [esp+32], eax
         ret
-; } \\ Alver, 2007-22-08 \\
-
+;------------------------------------------------------------------------------
+sysfn_min_windows:
+        call    minimize_all_window
+        mov     [esp+32], eax
+        call    change_task
+        ret
+;------------------------------------------------------------------------------
 uglobal
-;// mike.dld, 2006-29-01 [
 screen_workarea RECT
-;// mike.dld, 2006-29-01 ]
 window_minimize db 0
 sound_flag      db 0
 endg