Starting at the top, these are the commands that will get you going:
Xbox on - Wakes up Xbox One, can turn on television and cable/satellite set-top box.
Xbox turn off - Puts Xbox One to sleep/off, can turn off television and cable/satellite set-top box. You'll then have to confirm you want to turn it off with a "yes".
Xbox select - Shows voice command options for everything on the screen that is supported, highlighting relevant commands.
Stop listening - Stops Kinect from listening or cancels voice commands if Kinect is triggered during casual conversation.
Xbox help - Shows help menu with available options.
Xbox sign in/out or
Xbox sign in as [person] - Signs in/out an Xbox Live member.
Xbox show notification - Shows on-screen notification(s).
Xbox One is making a heavy play for TV and to do so, you'll need TV controls. Here's what you get:
Xbox watch TV - Launches cable or satellite TV from set-top box. We've used this a lot, it works really well.
Xbox show guide or
Xbox OneGuide - Launches OneGuide for cable or satellite TV subscribers. Less useful at the moment, as it's not coming to the UK until 2014.
Xbox volume up/down Xbox mute/unmute - Controls volume of TV set or AV receiver, if enabled in the settings.
Next you'll be wanting to get around the Xbox One interface, without using your controller. Here's what you need to drift from place to place:
Xbox go Home or
Xbox show my stuff - Returns to Home. This is the command you'll probably use the most.
Xbox Snap [app] - Launches activity in Snap mode. This is great fun and works well.
Xbox unsnap - Unsnaps activity in Snap mode.
Xbox switch - Switches focus of the activities in Snap mode and Fill mode.
Xbox go to [activity] - Launches specific games, TV shows, apps, notifications and sections of the dash. This is a hugely important command, you'll use it a lot.
Xbox show menu - In full screen: shows menu for whatever is on the screen. At Home: shows menu for whatever is in the current window.
Xbox go back - Returns to previous screen or menu option.
In games you'll probably use less commands, and more controller, although games like Zoo Tycoon offer plenty of voice control too. But the big ones relating to gaming are:
Xbox record that - Records the previous 30 seconds of gameplay, which is a great trick for catching those.
Xbox start a party - Launches the Party app in Snap mode, although you can start the party at any time.
Xbox use a code - Triggers Kinect code scanning for QR codes for game downloads, etc.
Xbox pause/Xbox play - Pauses gameplay or resumes gameplay, meaning no more scrabbling for buttons when the phone rings.
The Xbox one fancies itself as a complete media solution for your living room, so you'll be wanting to control your videos and music too. Here's what you need:

Xbox play [music/video] - Launches video and music playback.
Xbox play/stop/pause/fast forward/rewind/faster/ slower/skip forward/skip backward/next song/ previous song - Controls for media playback, works on both music and video.
Then you have Skype as a fully integrated feature. Here's what you need to say to get talking:
Xbox Skype [person] or
Xbox call [person] - Launches Skype call to a person from your Skype favorites list on your Xbox One.
Xbox answer/answer without video - Answers incoming Skype call.
Xbox hang up - Ends Skype call.
Xbox send message - Sends message to your Xbox Live friends.
Then there are universal commands to help you search and use Internet Explorer:
Xbox Bing pause [item(s)] - Launches Bing, then searches for the game, movie, TV show, game add-on or app using conversational voice. We've found it to be a bit hit and miss.
browse to [website] - Browses to a specific website when already in Internet Explorer.
While on the topic of Internet Explorer, the browser actually contains a lot of dedicated commands for navigation which only apply when it's open - here's a couple of useful ones:
Scroll up/Scroll down - scrolls the page up or down.
Click on [link] - clicks a link on the webpage.
Different apps require different voice commands that are specific to that app. We've listed most of the system commands here that you'll get to learn, but there's plenty more once you're in an app. We mentioned Zoo Tycoon, where you'll be able to talk instead of using buttons in some cases. Then in Snap you'll get highlighted options you can say instead of click. But if you get stuck, you can get a list of voice commands like this:
Xbox - Shows menu of voice command options and begins listening for the next command.
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