The Gamestream beta with co-op was announced a month ago but today it is available for download. Andrew Coonrad who is ex Nvidia did a video about the Geforce Experience update. He joined Logitech gaming after this video was shot but before that he was the face of gaming generation at Geforce gaming division.

Gamestream co-op you can invite a new player to help you kill the boss in the game. The feature includes play as me, and play with me, so two players can play the same game together. There is a big list of supported games and most of the support overlay, some support co-op and only a few will support a multiple controller including Broforce, DiRT Showdown, F1 2014 , F1 2015, Fifa 14, FIFA 15, Lego Marvel Super Heroes, Ultra Street Fighter IV and a few others.

Another impotent update brings the overlay controls inside of your game. This means you can access your features including Shadowpay recording. You can upload the video of how you killed some of the bosses and brat around it even within the game. This seems to be popular. There is a video that explains the whole thing. If you have a Maxwell or Kepler based GPU you should give this feature a try. Nvidia thinks a GeForce GTX 650 or higher graphics card with Intel i3-2100 3.1GHz or higher are the lowest end machine you can use. Anything more meaty should should give you a better expirience.

https://www.youtube.com/watch?t=168&v=ZqsT4Og28lI