// requires photoshop CS5+ and run in Photoshop
conn = new Socket();
var keep_serving = true;
while (keep_serving) {
    if (conn.listen(8123))  // any port
    {
        // wait forever for a connection
        var incoming;
        do incoming = conn.poll();
        while (incoming == null);
        
        new_cmd = incoming.read();
        try {
            if (null != new_cmd) {
                result =eval(new_cmd);
                incoming.writeln(result + "\nOK\n");
            }
            else {
                incoming.writeln("no command\nFAIL\n");
            }
        }
        catch (err) {
            incoming.writeln(err + "FAIL\n");
            incoming.close();
            delete incoming;
        }
    }
}