The Simulation Viewer Buttons

"Play" will begin playing the simulation with the current settings and at the current speed.

"Pause" will pause the simulation at its current location.

"Restart" will set the simulation back to the beginning.

"Finish" will move the simulation to the end.

"Forward" will move the simulation to the very end.

The "OK" button will bring up the "Save As" window and allow you to save a bitmap image of the currently displayed frame.