Currently, appletviewer (and the Java Plug-In, by way of AppletPanel) creates
one AppContext for each applet instance. Instead, one AppContext should be
created per codebase, or AppletClassLoader. This way, all applets from a
given codebase will share a single AWT EventQueue and AppContext. This will
eliminate the issues surrounding applets accidentally using each other's
EventQueues by way of shared static references to each other's threads or
GUI objects.