Starts SyntheSim mode.  Use O to overwrite the existing run without prompting.  In SyntheSim mode all changes to model values will trigger simulations and Venapp sliders will simulate as they are moved, saving the results when they are released.  If you display a sketch in SyntheSim mode the behavior graphs for each variable will be displayed, but the sliders will not be created.

To leave SyntheSim mode use SPECIAL>STOPSIM.