WindowPeer is an interface that defines the basis for a window.
public abstract interface java.awt.peer.WindowPeer
   extends java.awt.peer.ContainerPeer {
  // Interface Methods
  public abstract void toBack();
  public abstract void toFront();
}
Puts the window's peer in the background of the display.
Brings the window's peer to the foreground of the display.
ContainerPeer, DialogPeer, FramePeer