Part 1: Compile with MASM

Create a file name test.asm

.486 
.model flat, stdcall 
option casemap :none 


MessageBoxA PROTO STDCALL :DWORD, :DWORD, :DWORD, :DWORD 
ExitProcess PROTO STDCALL :DWORD 

.data 
     ttl db '11111',0 
.code 
start: 
     invoke MessageBoxA,0,offset ttl,offset ttl,0 
     invoke ExitProcess,0 
end start 

Now compile and link with command:

ml /coff test.asm /link kernel32.lib user32.lib