Big new feature: Simultaneous multiplayer, the Camera will track two dancers at once.
For example, official statistics track two different measures of government spending.
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Then there's the issue of making sure not one but two phones are fully charged, and keeping track of two sets of power cords.
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Keeping track of two screens could have been a mess, but it's actually pretty intuitive.
The Federal Trade Commission, which called for a Do Not Track Button two years ago, will enforce the effort.
Further down the track, two more types await large-scale trials.
Windows 7, however, could help turn that around, reigniting Microsoft's growth prospects just as the shift to Windows 3.1 put it on the right track nearly two decades ago.
Ambassador Albright also said its a two track approach: peace talks and war crimes investigations.
We have lost track of our two most important assets: customers and employees.
The double gold medallist, who grew up in Cheshunt, won two track cycling events at the London 2012 Games.
Although the first day she was on track, her two day average is now behind where she needs to be.
The move had been expected for weeks, as the FBI tries to boost public awareness in its efforts to track down the two elusive murder suspects.
For spectators worldwide, mobile was a hugely popular channel for viewing and keeping track of the two week games. 12 million people watched the Olympics on the BBC via smartphone or tablet.
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There are fabulous day walks at both Cradle Valley in the north and Cynthia Bay (Lake St Clair) in the south, but it is the outstanding 80.5km Overland Track between the two that has turned this park into a bushwalkers' Mecca.
But the project's current phase also includes replacement of five two-track bridges, which required reducing the number of active tracks from four to two.
Metro-North President Howard Permut calls the work the wholesale reconstruction of a two-track electrified railroad.
And many of her reforms showed actual promise, such as her two-track idea for teachers.
America decided to pursue a two-track model: The use of military commissions and civilian trials.
The author cleverly lays a two-track story, one story line following the good guys, the other following the low-life evildoers.
His new approach, coupled with a persistent bronchial infection, had Teixeira on track for career lows two months into the season.
Completed in just 10 days on a two-track machine, it takes his no-frills approach to recording to new heights - resulting in a refreshingly direct sound.
But I thought her two-track option was a really good idea, allowing young teachers to enter the system without tenure but with a much better salary upfront.
The two former track teammates at Auburn first hosted the self-funded Wall Street Decathlon in 2008, but the real start, according to Maloney, was in 2009 when they introduced fundraising.
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Its 25 stations and 23km (15 miles) of track, running along two lines, serve only part of the capital and stretch only some of the way to the city's airport.
It is certainly true that the Stones did spend a few days in early 1964 dashing out songs on an old two-track recorder in Regent Sounds Studio at 4 Denmark Street - and the rest is musical history.
Two catamarans track the boat's progress.
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While the Bush Administration at last appears to be recognizing this reality, its two-track response is quite astonishing: On the one hand, the Administration evinces no apparent concern over the catalytic effect the Webster testimony is having on congressional efforts to gut the defense budget.
Despite an overhaul of the bankruptcy laws in 1998, it is still awesomely difficult to foreclose on debts: the definition of bankruptcy turns on net worth, as opposed to cash flow, and the process is slowed down by a two-track system that separates forced restructurings from forced liquidations.
The two golfing buddies track each other in personal worth as their volatile shares trade each day.
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