While the script is running, you will notice that the cursor is busy and you cannot type in any other commands at the prompt. This is because we have used the built in method waitForComp]etion() in the script which prevents the user from executing other DOS commands while the simulation is running. We will take a look at this statement again a little later, just be aware that if we did not include the waitForCompletion() command in the script, the prompt would continue to remain active even while the simulation is being run. And if you find yourself running batch files, or linking your simulations with optimization software such as !Sight or Mode1Center, this knowledge will come in handy.