Hello world

.386
.model flat, stdcall
option casemap:none

include \masm32\include\kernel32.inc
includelib \masm32\lib\kernel32.lib
include \masm32\include\user32.inc
includelib \masm32\lib\user32.lib
include \masm32\include\windows.inc

.data
foo db "This is my first post.", 0
bar db "Hello World", 0

.code
  proc:
    invoke MessageBox, NULL, addr foo, addr bar, MB_OK
    invoke ExitProcess, NULL
  end proc