I have never flown into DEN on an international flight. My parents have but I didn't ask them how it works out.
The domestic pax arrive through the terminal on the interior east and west sides of level 5 from the arrival side of the train. The international arrivals arrive on the north side of the terminal on level 5 also but from the customs area.
How do the pax arrive at the concourse and end up at that customs point. Do they arrive at certain international gates and take a dedicated train to the terminal?