Since A7.06

#include <acknex.h>
#include <windows.h>
#include <default.c>

function MyMessageFunction(UINT message, WPARAM wParam, LPARAM lParam);

function main() {
on_scanmessage = MyMessageFunction;
}

function MyMessageFunction(UINT message, WPARAM wParam, LPARAM lParam){
if(message== WM_SIZE){ beep();}
}