I'm marking this as a community wiki because I'm not really looking for one complete answer. So if you feel like posting one or two things that will activate the UAC prompt instead of a comprehensive list then go ahead.
What actions in Windows will activate UAC? I'd like to avoid it as much as possible because my application doesn't need admin privileges. And I'm sure many other people want to avoid it.
Specifically, I would like to know if reading from the registry would activate it. Or writing to it?
You don't need to address the above question, just anything that will activate it is fair game.
It's really hard to Google anything about UAC because you get bombarded with articles about how to disable it. And I'd rather not have my application make the assumption UAC is disabled.