The concept of the post-PC era dates back to 1999 when M.I.T. Senior Research Scientist David D. Clark first coined the term. At the time, the notion of a world powered by portable, single-task devices seemed very, very far away. Palm Pilots and brick-shaped Nokia cellphones were then considered to be cutting edge. There were no smartphones -- a BlackBerry in 1999 was simply a two-way pager.