Windows

If you are on Windows, launch fasmw.exe and enter the following code:

 include 'win32a.inc'

 format PE GUI
 entry _start

 section '.text' code readable executable
 _start:
    push 0
    push 0
    push title
    push message
    push 0
    call [MessageBox]
    call [ExitProcess]

 section '.data' data readable writeable
    message db 'Hello from FASM!', 0x00
    title db 'Hello!', 0x00

 section '.idata' import data readable writeable
 library kernel, 'kernel32.dll',
         user, 'user32.dll'

 import kernel,\
        ExitProcess, 'ExitProcess'

 import user,\
        MessageBox, 'MessageBoxA'

Again, do not worry if you hardly understand anything in this code; it will begin to become clearer starting with the next chapter.

In order to run the preceding code, go to the Run menu and select Run.

Admire the result for a few seconds.