VPE is a system to make the equivalent of “source special” marks in a PDF file. Clicking on a mark will activate an editor, pointing at the source line that produced the text that was marked. The system comprises a perl file (vpe.pl) and a LaTeX package (vpe.sty); it will work with PDF files generated via LaTeX/dvips, pdfTeX (version 0.14 or better), and LaTeX/VTeX. Using the LaTeX/dvips or pdfLaTeX routes, the (pdf)TeX processor should be run with shell escapes enabled.