Ya its right ,,the World Smallest Computer..
Its just like your normal computer and have a great portability.
Comptek has launched UMPC in India, claimed to be the smallest PC in world with all features of a tablet PC including Wi-Fi, Bluetooth and Web camera inbuilt. Weighing only 529 grams, the Wibrain Bl Ultra Mobile Computer is a small (approximately 7.5"x3.25"), Tablet PC with touch screen, mouse pad, 1.2 GHz processor, 1 GB RAM, 60 GB HDD, integrated stereo speakers, USB and 24 Pin connector for external monitor, battery backup and comes loaded with a version of Ubuntu Linux or Wmdows XP.
Long before there were iPod Nanos and laptops, in fact, long before before Bill Gates was even born, a British mathematician proved that it was possible to build computing machines that could be programmed to carry out any calculation that could ever arise. The mathematician was Alan Turing, and the theoretical device he invented in the 1930s is nowadays called a Turing machine. (There is not just one Turing machine; rather they are an entire class of hypothetical computing devices.
The computer built at Bletchley Park, like all computers since, is much more complicated than Turing's theoretical machine. In principle you could build a physical Turing machine, and in fact several people have done so, but they are not useful; it could take tens or hundreds of years to program them to carry out useful calculations, and for some problems even longer to find the answer. They may be simple, but they are not practical. Their importance is that they help us understand what computation is and how it works. (For instance, the security of your credit card number when you order something online depends crucially on mathematics involving Turing machines.)
The idea of building machines to do arithmetic (in particular) is almost as old as mathematics itself. The earliest attempts, such as piles of pebbles or the abacus, were not really carrying out the mathematical computation, they simply provided a convenient way to store numbers for the human operator who actually did the math. Blaise Pascal (1623 - 1662) was one of the first people to design and build a machine that really did carry out calculations, called the Pascaline. Charles Babbage (1791 - 1871) is another famous name in the history of designing calculating machines. But all of the early attempts focused on designing machines to perform particular calculations or particular kinds of calculations. No one thought of building a machine that could carry out any computation.
Part of the reason is that it was not until the 1930s that anyone had tried to specify precisely exactly what is meant by "a computation." Turing invented his "Turing machine" concept in order to provide a precise definition: a function from numbers to numbers (say) is declared to be "computable" if and only if it can be calculated by some Turing machine.
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