Twitch wants to move beyond live streaming to cover your game communications, and to that end it bought Curse back in August. Just what is it doing with its newly acquired app, though? Well, now we know: Curse is rolling out desktop support for both video calls and screen sharing on top of its existing voice and social features. You and four other people can now see each other while you play, and share what's on your display if you want to brag about a victory or show vital info to your teammates.