Please add links, quotes, or a picture of the question under discussion (there might be several "sample papers" floating around).
For instance, here is the question from 10 years ago. I don't feel like downloading the latest because I don't want NI to bug me about scheduling an exam.
For C, it blocks events from happening ON THE FRONT PANEL. User Events can still be added to the event queue.
Thanks for that great answer! It works for me. Apologies for not giving more info but I am working from my Android tablet and it is proving to be horribly fiddly.
Expanding a bit- not just User Events, but Value(Signaling) property nodes will still fire (AFAIK) when the front panel is locked. You just can't click buttons on the front panel.