Zillions of components - what is calling what?

Let's say you've been plonked into an environment where people have
been programming with Mason for years. There are billions and billions
of Mason components being called all over the place.

You've been asked to add some 'simple' functionality to an existing
web site - it's not much different to what's already there, but you
have absolutely no idea which component is calling which component
in the mess of components and subdirectories and include files.

And there is (ka-ching) only very little external Word documentation on
the system.
What do you do? Can I somehow get Mason to show me a debug trail
of Mason components being called, when I invoke a web page?

I've been working on just existing Perl/CGI web pages for
years, but somehow always managed to find my way around. With Mason
I'm finding it takes me a long time to figure out the program flow.

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