The Lightning Component Developer Guide reference includes the event lntg:selectSObject. Per the docs, this event:
Sends the recordId of an object when it’s selected in the UI.
However, the sample code doesn't really help me understand when or why I would use this standard event. Does it cause some sort of interaction with SF1/LEX? Does it mark the record as recently viewed (like FOR VIEW)? Is it just a helpful standard event that all my components can expect?