April 05
Prof. Ismael H. F. Santos -  ismael@tecgraf.puc-rio.br                                                          2
Introduction
nInternet and WWW have emerged as global ubiquitous media for communication and changing the way we conduct science, engineering, and commerce. nThey also changing the way we learn, live, enjoy, communicate, interact, engage, etc. It appears like the modern life activities are getting completely centered around the Internet.