NONONONO! That word ("intranet") does not exist! It is a stupid
invention of people who don't know the difference between "the Internet"
and an "internet". I hate the stupid word. Really.
As I remember it, there is a more or less official document about this,
but I haven't found it again... The Internet Protocol
was invented to connect together local networks of different kinds
(ethernet, Xerox PUP, OSI networks, XNS, other other proprietary network
architectures), hence the "inter" part of "internet". The big global
internet would then be "the" Internet.
See also http://en.wikipedia.org/wiki/Catenet .
-Olaf.