"Perhaps you've got a few computers around the house -- the Mac
that the kids love, the PC that runs Linux in the den, the old NeXT
computer you found at a garage sale and the Windows laptop you take
on the road.
"All are connected to a network, and all access the Internet
flawlessly. You even protected them behind a firewall running
"But something is missing from the setup: None of the machines
seem to know how to talk to each other..."