You are looking at a very old, but free version of the course. If you are interesed the most recent version, check it out on the Perl Maven site.

9.5. Complex network servers

There are many other optiong to build a network server.
Besides providing more complex interaction with the single server one can
configure it to be able to handle multiple clients at the same time.

Just replace "use base 'Net::Server';"
by "use base 'Net::Server::PreFork';" and you have a preforking 
web server.

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