# How to use the aux file

This is not a terribly well-formed question, sorry. I don't really know what information is in the .aux file, or how I can make use of it in other (related) documents. What's the best reference for understanding how this works?

One common thing I would like to be able to do is the following: I have a book that contains lots of \labels. I would like to be able to reference those labels from the solutions manual, which is separately created (as a .tex file) and generated (as a PDF).

-
I have a feeling this question should be two separate questions. Or it should ask about the second part and add the first as a guess what might be the direction of the solution; this would require a different question title though. –  doncherry Mar 14 '12 at 0:08

So if you want to read an external aux-file you must be careful. E.g. an aux-file contains lines which should be written to the toc-file (\@writefile{toc}) which you don't want to process in this case. The xr-package mentioned by Boris e.g. loops through external aux-files and looks for \newlabel commands but ignores everything else.
I think you need the package xr - it allows one tex file to use eXternal References, defined in the .aux file of another tex file