I have found that most of the CPAN packages that provide debugging provide a special class global variable (by using Exporter or 'our') that enabled debugging in the class. While DEBUG is a sufficiently common variable that people will set if they want to debug something, you can't guarentee it, and it's better if your class provides it's own way to do it.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain