setUndecorated() does not seem to function. The following sample should display a frame without any decoration:

import java.awt.*;

class UndecoratedFrame extends Frame {
        public static void main(String[] s) {
                new UndecoratedFrame();
        }

        UndecoratedFrame() {
                setUndecorated(true);
                add(new Label ("UndecoratedFrame"));
                setSize(200, 100);
                pack();
                show();
        }
}

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