This is an experimental package aiming to provide a different approach for multidocument works (mainly, books with a document per chapter). Unlike the \include mechanism, every subdocument is a complete normal LaTeX document and may be typeset separately. What the package does is sharing the .aux files.

The package is part of the bezos bundle. The present release is an alpha version, and no attempt has yet been made to allow it to work with, say, hyperref.