This is a new logic script for selecting one avatar from those that are nearby and passing along that selection as a bang message with that avatar's identity. To a downstream consumer of these bang messages, the av ID payload behaves the same as you would expect from typical sensors like the trigger volume script.
The settings allow you to optionally narrow your focus to only people inside a bubble and not all people in the scene:
To be sure, you still need to trigger this using some other script's bang message. That could be via a randomizer, via a sensor, or via any other Reflex-compatible script.
You could use this in various games and for raffle-type giveaways.