Ultra-mobile PC's are typically known for being much smaller
than other personal computers, being almost as big as tablets. They
are generally much cheaper.
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Desktop PC is Fixed Location but can be moved but Ultra Moble is
made to be taken to Lan Parties for use in Network games with
friends.. can also be a Notebook and or laptop PC and now can be a
Pad based unit.
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The smallest PC that Samsung has made belongs to their
Ultra-Mobile PC line, the Q1. The Q1 PC's size makes it look more
like a large tablet than a PC.