People started using computers outside the corporate research lab in the 1950s.  The early computers created in garages were brought to market in the mid 1970s.  The PC came out in 1981.  The 1990s saw the early explosive growth of the laptop and the current decade is when the PDA and other wireless devices took off.  This 50 year history is punctuated by various breakthroughs in the computer human interface.  Each one of these breakthroughs changed usage, behavior and ultimately society.

Mainframe computing of the 1950s looked like a technological religion.  Well lit, air conditioned rooms housed large computers that were …