@@ -1,13 +1,25 @@
 import processing.glw.*;
 
+PGraphics stage;
+
 void setup() {
-  size(2560, 1440, GLW.P2D);
+  // The main window will be hidden, only GLW.RENDERER
+  // can be used in size()
+  size(100, 100, GLW.RENDERER);
+  
+  stage = createGraphics(2560, 1440, GLW.P2D);
+  GLW.createWindow(stage);
   frameRate(180);
 }
 
 void draw() {
-  background(255, 0, 0);
-
-  fill(255);
-  text("FPS: " + frameRate, mouseX, mouseY);    
-}
+  // The draw() method is used to update the offscreen surfaces,
+  // but not to draw directly to the screen.  
+  stage.beginDraw();    
+  stage.background(200);  
+  stage.fill(255);
+  stage.ellipse(mouseX, mouseY, 50, 50);  
+  stage.fill(0);
+  stage.text(frameRate, 100, 100);
+  stage.endDraw();
+}
@@ -0,0 +1,28 @@
+import processing.glw.*;
+
+PGraphics canvas1;
+PGraphics canvas2;
+  
+void setup() {
+  size(100, 100, GLW.RENDERER);
+  canvas1 = createGraphics(320, 240, GLW.P2D);
+  canvas2 = createGraphics(320, 240, GLW.P2D);
+  GLW.createWindow(canvas1);
+  GLW.createWindow(canvas2);
+}
+
+void draw() {
+  canvas1.beginDraw();    
+  canvas1.background(200);
+  canvas1.ellipse(mouseX, mouseY, 100, 100);
+  canvas1.endDraw();
+
+  canvas2.beginDraw();
+  canvas2.background(170);
+  canvas2.ellipse(mouseX, mouseY, 50, 50);    
+  canvas2.endDraw();      
+}
+  
+void keyPressed() {
+  GLW.getFocusedWindow().setVisible(false); 
+}