まったく自然な文法とか
例:
Begin main routine.
Create window named myWnd with width 640px, height 480px and title "ウィンドウだよ".
When myWnd is clicked then call myWnd_Clicked.
Enter message loop.
End main routine.

Begin myWnd_Clicked routine.
Close myWnd and exit program.
End myWnd_Clicked routine.