For years, when you needed a real portable computer, the only way to get it was to turn to a laptop. Then, as mobile processors became more powerful and operating systems more flexible, you had a choice: You could either stay with the traditional clamshell design or go with a tablet, which offered you less functionality and power but greater convenience by subtracting the keyboard from the equation altogether. So it was just a matter of time until enterprising manufacturers realized that adding or removing the keyboard was all that was needed to turn one into another.
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