The package provides a means of creating references to labels in another file (say, otherfile.tex) by reading that file's auxiliary information from LaTeX processing (otherfile.aux). This is achieved by the \externaldocument command, which also permits “relabelling” all of the external file with a prefix for all of its labels.

The package is part of the tools bundle in the LaTeX required distribution.

The authors are David Carlisle and Jean-Pierre Drucbert. The package is Copyright © 1994 David Carlisle.