[pdftex] debugging pdf(la)tex

[Mark Moll]

Hi,

I'm wondering how I can debug underfull/overfull boxes with pdflatex. I 
think Context has some debugging functionality, but I am using LaTeX. What 
I'd like to have is something that shows underfull/overfull boxes in the pdf 
file by drawing a rectangle or by inserting a pdf annotation. Is there some 
kind of exception handler in TeX so that I can do something like: "if an 
under/overfull error occurs execute my debug routine"?

-- 
Mark