I would never presume to explain such a thing. I would direct you to:
http://www.w3.org/hypertext/WWW/Protocols/Overview.html
for the official overview. One thing I can say
Perhaps this and related pointers should go into the FAQ.
--
chris marrin Silicon http://www.sgi.com/Products/WebFORCE/WebSpace
(415) 390-5367 Graphics http://reality.sgi.com/employees/cmarrin/
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"As a general rule, don't solve puzzles that open portals to Hell."