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I can't figure out what they are doing with these shared variables

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This is from the CompactRIO example provided by NI in LabVIEW 2020, called "LabVIEW FPGA Control on CompactRIO".


I'm basically just reverse engineering the example so I can apply it to my own project, but I can't figure out what the heck they are doing with these shared variables. 




They are writing to them in this subVI, but I can't find where they are reading from them. And I don't see any spooky streaming or anything going on where the reading might be "invisible" or hidden. Surely they are reading somewhere....what would be the point of writing to them?

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Accepted by topic author David99999

Is there a "UI Main VI" in that same project?

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Ah crap. Ok. I looked at that, but I was expecting to find shared variables that looked the same, but in read access mode. Now I see the the read variable functions




Never seen it done that way before! I wish the courses I've done just started out explaining it do it this way. I've basically been coding like a Neanderthal. But I guess that's my fault for not going further into the courses

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Yes, you will learn many nuggets along the way that make something easier and you wish you had known it all along. There was a thread with many great, random nuggets in it:

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