Untitled

<title>Broadcast target</title>
<body>
<script>
function onStorage() { // Note: IE and FF lags on large numbers of windows
    // Note: IE limits/delays broadcast range (number of windows)
    var cmd = localStorage.getItem('command');
    document.getElementById("result").innerHTML = cmd;

    if (cmd.match(/close/)) {
        window.close();
    } else {
        document.body.style.backgroundColor = 'rgb(' + ~~(cmd * 255) + ',' + ~~(cmd * 255) + ',' + ~~(cmd * 255) +  ')';
        document.body.style.color = 'rgb(' + ~~(Math.random() * 255) + ',' + ~~(Math.random() * 255) + ',' + ~~(Math.random() * 255) +  ')';
    }
}

var webkit = !!navigator.userAgent.match(/AppleWebKit\/(\d+\.\d+)/);

if ('v'=='\v') { // Note: IE listens on document
    document.attachEvent('onstorage', onStorage, false);
} else if (window.opera || webkit){ // Note: Opera and WebKits listens on window
    window.addEventListener('storage', onStorage, false);
} else { // Note: FF listens on document.body or document
    document.body.addEventListener('storage', onStorage, false);
}

function broadcast(cmd){
    localStorage.setItem('command', cmd);
    if (window.opera || webkit) {
        // Note: Opera and WebKits don't fire storage event on event source window
        // Do it manually
        onStorage();
    }
}

</script>
<button onclick="broadcast(Math.random());">Broadcast</button>
<button onclick="broadcast('close-'+Math.random());">Close all</button>
<pre id="result"></pre>
</body>