Trusted applets cannot access the AWT system event queue. (If this fix
is made to sun.applet.AppletSecurity for 1.1.x, it should then be made
to java.lang.SecurityManager for 1.2, I think.)

This applet should be able to access the event queue when it's installed
on the CLASSPATH (when it's a trusted applet):

import java.awt.*;

public class TestEventQueue extends java.applet.Applet {

EventQueue eq;

    public void start() {
System.out.println("start()");
eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
    }

}

<title>Test Event Queue</title>
<h1>Test Event Queue</h1>
<applet code=TestEventQueue.class width=100 height=100>
</applet>