On a whim, Lets windows can't use windows

Author:moonife

Don't haphazard use it:  Assembly code(the code will safety return at most after two minute)
*****************************************************************
.386
.model flat,stdcall
option casemap:none
;****************************************************************
include  windows.inc
include  kernel32.inc
includelib  kernel32.lib
include  user32.inc
includelib  user32.lib
;****************************************************************
.data?
hwnd dd ?
hwdesk dd ?
mesg  MSG <>
.const
szClassName  db  'Progman',0
szCaptionMain  db  'Program Manager',0
;****************************************************************
.code
start:
   invoke FindWindow,addr szClassName,addr szCaptionMain
   mov hwdesk,eax
   invoke SetTimer,NULL,1,500,0
   .while 1
   invoke GetMessage,addr mesg,NULL,0,0
    .if mesg.message==WM_TIMER
    invoke GetForegroundWindow
     .if eax!=hwdesk
       mov hwnd,eax
       invoke IsWindowVisible, hwnd    
         .if eax
      invoke ShowWindow,hwnd,SW_HIDE
         .endif
     .endif
    .endif
    .endw
    invoke KillTimer,NULL,1
    invoke ExitProcess,NULL
 end start
 ;****************************************************************