程序代码：

                .386
                .model flat, stdcall
                option casemap:none
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
include         windows.inc
include         kernel32.inc
includelib      kernel32.lib
include         user32.inc
includelib      user32.lib
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
                .data?
szBuffer        db      1024 dup(?)
dwId            dw      ?

                .data
szTitle         db      'Caption', 0
szFormat        db      '"%d"', 0


;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
                .code
_EnumWndProc    proto   hWnd:DWORD, lParam:DWORD

START:
                invoke  EnumWindows, offset _EnumWndProc, NULL
               
                invoke  ExitProcess, 0
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


_EnumWndProc    proc    hWnd, lParam

                ;invoke  GetWindowText, hWnd, offset szBuffer, sizeof szBuffer
                ;invoke  lstrlen, offset szBuffer
               
                invoke  GetWindowThreadProcessId, hWnd, offset dwId
                invoke  wsprintf, offset szBuffer, offset szFormat, dwId
                invoke  MessageBox, NULL, offset szBuffer, offset szTitle, MB_OK
               
                ret
_EnumWndProc    endp

                end     START