debugging technique

Dear LiveJournal Genie,

Suppose that whenever I click the mouse at a certain widget, the file named "a.txt" gets re-read into my program. I want to figure out how this is happening (i.e. which function is reading the file), so I look at the event handler for the click, but the code is unreadable, and it calls 20 other functions, each of which call 20 functions, etc.

What's a quick way to find out what function is loading the file?

Portuñol

This text (in English) is about Portunhol. It has lots of samples of portunhol, from totally botched Spanish e.g. "jo quiero un cuepo de Cueca-Cuela", to border dialects, etc, and even some historical dialects, IIRC.