A side note. Tell him to consider the Programming Perl and other books recommended here as the right way to do perl, not what he sees in the Interwoven code. I've worked with Interwoven in the past and the code is very spotty in parts. A friend of mine was in the same boat as your friend, and I had to correct a number of bad habits he was picking up from the Interwoven code, which if I recall correctly is production code that does not use strict, warnings, or taint. Scary.
Also, if I recall correctly, Interwoven uses their own version of perl called iwperl that is built off an older version of perl. Be careful.

-pete
"I am Jack's utter lack of disbelief"