If you right click a property node with the Value(Signaling) property selected and click Help for Value(Signaling), you will get the LV help for it which says:
This property updates the value of an object similar to the Value property, however, Value (Signaling) also causes LabVIEW to generate an event as if the user had interactively changed the value of the object.
Basically, if you used an event structure and registered for a value change event for that control, that event will fire when use the signaling property.
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here, here, here, here and here are a few you can start with and here are some tutorial videos. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
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