Depending on the InteractionSourceType of the interaction source, this returning true could represent a number of equivalent things: main button on a clicker, air-tap on a hand, and the trigger on a motion controller. For hands, a select-press represents the user's index finger in the down position. For motion controllers, a select-press represents the controller's index-finger trigger (or primary face button, if no trigger) being fully pressed. Note that a voice command of "Select" causes an instant press and release, so you cannot poll for a voice press using this property - instead, you must use GestureRecognizer and subscribe to the Tapped event, or subscribe to the InteractionSourcePressed event from InteractionManager.
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