Micro soft wants to take over all your TV viewing.

Rather than pitching the Xbox One as the next step in the console war, Microsoft interactive entertainment business president Don Mattrick called it the first step towards something else: an "all-in-one" device.

To those looking at the future of entertainment, the motion-detection features of Kinect offer exciting opportunities. How would you feel if your TV could offer to switch channels because it detected you weren't paying attention?

If the Xbox One is powering all sorts of interactive TV and communication services, does that drain power meant to run the best games?

Microsoft says the secret to the new system is in the operating system or, in reality, systems.

The Xbox One has three operating systems: a cut-down Windows, the Xbox operating system for games, and a third that, the designers say, gets the other two to talk to each other.

Unlike the launch of Sony's PlayStation 4 earlier this year, Mattrick showed off the Xbox One within minutes of his opening remarks.

He also showed off key games, including Forza Motorsport 5, FIFA 14, EA Sports UFC, Quantum Break and, perhaps most significantly, Call of Duty: Ghost.

The TV features of the Xbox One include changing channels by voice control or switching from TV to game playing with a two-word command.

A feature called Snap lets you open a small window to one side of the screen that can show game action, television, a web browser or Skype window.

There are many key questions remaining for Microsoft to answer, not the least of which is the Xbox One's release date and price.

Microsoft also emphasised the power of its redesigned Kinect at launch, but failed to outline whether users would need to wave at the unit to activate it.

Many of those questions will be revealed in a few weeks at the E3 games expo in Los Angeles.

XBOX ONE: KINECT

Comparing the second generation of the Xbox motion detector is a bit like comparing Angry Birds to Snake on your old Nokia. Kinect's camera has twice the field of view and three times the fidelity of picture. It constructs a 3D image of the person and will determine a motion as subtle as a shoulder shrug. It can also detect your heart rate from fluctuations in blood flow in the skin, and lets you stand closer to the TV.