William, I am starting to better understand how you would like your application to execute. It sounds like if there is a fluctuation in the pressure of the HPC you would like the VI to pause until you have a chance to fix the problem and then it should continue when you press the pause button on the front panel. If this is indeed how you would like the VI to behave, you may want to take a look at the Wait For Front Panel Activity function. This should allow you to pause the execution of the VI until there is input from the pause button on the front panel. If you want the VI to restart you might consider using an event structure that would execute code (the HPC process) on the value change of a control i.e. the reset button.
I hope these resources help. Let me know if these functions are relevant to your application. Shea C. Applications Engineering
