Hey NN Q,
If you would like to open a VI on your computer you first need to place a Open VI Reference function donw on the block diagram. Once you have configured the path to the VI you want to access you can then wire the VI reference to a Property Node. This will give you access to many different properties. Use the operate tool to click the node and bring up the properties available and select Front Panel Window » Open. You can then use a Invoke Node to run the VI if necessary. Once you get a close from the main window you can stop the VI and close the front panel. You can close the VI by stopping the VI, making the Front Panel not visible (write a False to the FP.Open property) and closing the reference.
Repost if you want more help!
Andy F.
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National Instruments