| <i>Before 1982, one can only do one thing at a time on any computer.</i><p>This might be true from a GUI perspective, but people have been able to do multiple things on computers since the late 1950's.<p>In fact, the alleged inventor of time sharing systems, John McCarthy, was already reminiscing about the history of time sharing just a year after the Blit Terminal was invented:<p><a href="http://www-formal.stanford.edu/jmc/history/timesharing/timesharing.html" rel="nofollow">http://www-formal.stanford.edu/jmc/history/timesharing/times...</a>