Borderlands 2 Split Screen. But it doesn't allow for split-screen co-op — if you want to play with friends, you'll have to do it online. If you want to copy or move characters between save folders, go to Documents\My games.
Tried a link pointing me to a thread on here which is "private or no longer exists". Mike says he gets the biggest chunk of screen because it's his TV. But it doesn't allow for split-screen co-op — if you want to play with friends, you'll have to do it online.
This is a subreddit dedicated to local multiplayer games, which are games that are played on one system among multiple players, either single or split screen.
The problem is that when he tries to join the game it states that he has insufficient permission and can only play in offline mode.
Anyway, it doesn't seem too hard to adapt that method to the second games, so maybe you can jerry-rig it to. If you want to copy or move characters between save folders, go to Documents\My games. PC games don't often support split-screen or local co-op play.