The package provides a means of marking a source, so that samples of it may be included in a document (by means of the listings package) in a stable fashion, regardless of any change to the source.

The markup in the source text defines tags for blocks of source. These tags are processed by a shell script to make a steering file that is used by the package when LaTeX is being run.y

The author is Joel Hoffman. The package is Copyright © 2008-2010 Jobst Hoffmann.