This package “looks over your shoulder” and keeps track of files \input’ed (the LaTeX way) or \include’ed in your document. You then have permanent access to the name of the file currently being processed through the macro \finkfile. FiNK also comes with support for AUC-TeX. As of version 2.2.1, FiNK has been deprecated and is not maintained anymore. People interested in FiNK's functionality are invited to use a package named currfile instead.