Redirecting error messages

Hello

I do not understand how the error messages are generated. They appear to go
through some other stream than *standard-output*. (I have tried to bind both
*standard-output* and *error-output* to a file but nothing is streamed to
the file, the error messages are still printed to the REPL.)

What I want to do is to capture all error (And warning) messages and
redirect them to a string (for futher processing) but I do not understand
the underlying code that generates these messages. Apparently, a stream is
created with MAKE-STRING-OUTPUT-STREAM, but I have no idea when, or where,
this stream is created, let alone the name of it. (It might be worth
mentioning that I use the struct version of powerloom)

Perhaps I am going the wrong way here but I have not found any documentation
on how to handle exceptions, and wether or not exceptions are thrown when
there's a parse error in a query for instance.

I use LISP and only the API functions, s-retrieve, s-ask, etc. It is
s-retrieve I use the most and would really like to be able to handle parse
errors and make my own error handling for this (quite simply just send the
entire error message to the user (who does not have the REPL infront of
him/her :))).

Thanks in advance,
-- 
Magnus Malm

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