I'm writing a wrapper function that would like to "record" all the changes that
were done by HTTrack so that it can go change them again later.  (Basically, I
want to rewrite local links, but there's no filter to do this, so I'm trying
to record what was done by comparing pre-and-post processed html).

The key question - will HTTrack call my filter "interleaving" calls for
various pages?  Let's say I'm processing page A and B, is it ever possible for
the filter to be called like:

preprocess A
preprocess B
postprocess A
postprocess B

if so, is there any way for me to tell which file triggered a particular
event?