At E3 2015, Microsoft announced one of the groundbreaking feature for Xbox One, "Xbox One/Xbox 360 Backward compatibility". This new feature will allow Xbox One players to play their Xbox 360 games on Xbox One. Microsoft's Mike Ybara at E3 2015 played a live demo of Mass Effect 1 on Xbox One to show the working of the feature.
Today, Mike Ybara via Twitter answered an common question on Xbox One/Xbox 360 Compatibility feature: How To Open Xbox 360 Guide In Backward Compatible Game On Xbox One? Ybara stated that to do this, Push the Menu + View keys on Xbox One controller at the same time.
"Common question: How do I bring up the 360 guide in a back compat game on X1? Push the Menu + View keys on controller at the same time." tweeted Ybara.
Common question: How do I bring up the 360 guide in a back compat game on X1? Push the Menu + View keys on controller at the same time.
— Mike Ybarra (@XboxQwik) June 16, 2015
Additionally, Ybara confirmed that multiplayer totally works on Xbox 360 backward compatible games, Cloud game saves etc, everything works.