Take a few minutes now to experiment with driving the robot. Along the way, occasionally pausethe simulator to save your position to the Previous / Next states stack. 

With the simulator paused, we can now retrace the path that the robot has driven by going back to a previously saved state. Click on the Previous and Next state buttons to experiment with this feature.

Restoring saved state

                                                                                                                            Restoring saved state

When finished, click the Stop  button on the Toolbar to end the simulation and restore the robot back to its original position.