There are many ways to access VI Server references on a LabVIEW block diagram. Here are just a few:
What do you do when you are done with these references? Do you need to close every single one of them? Does the order in which you close them matter? What if you access these references in a loop?
The answers to all of these questions and more can be found in the Closing References in LabVIEW white paper on ni.com, which provides a one-stop shop for all information regarding VI Server references and when to close them.