Kinect, xbox messages

I would like to know how to open a message when it pops up, like a friend sent you a voice message or invites you to a game or even a Achievement pops up, like how to open it with your voice?? Please help

I would like to know how to open a message when it pops up, like a friend sent you a voice message or invites you to a game or even a Achievement pops up, like how to open it with your voice?? Please help

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