|Perl: the Markov chain saw|
Teachers can usually arrange to have a local expert in to talk to a class ;-)
If he knows some SQL, perhaps DBI would serve as well as CGI. It has fewer magic tricks. I first learned perl with CGI, and was confused when applying functions to array references. I had to learn what was perl's normal behavior, and what was CGI magic.
I think that the teacher should concentrate on basics in his own studies, with emphasis on where to find TFM. Get him signed up here. Show him perlop, perlsys, and perlfunc, not to memorize, but to skim and browse. 'Learning Perl' may be a better guide for the teacher, with its systematic introduction to fundamentals.
...many of the students will have trouble figuring out how to turn the computer on.
Just hint that there's pr0n inside. They'll figure it out.
Update: Corrected typo and speeling, ++jeffa.