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+prerex, version 6.0: Macros for prerequisite charts, with associated
+editor and viewer applications. 
+
+This package consists of 
+
+  prerex.sty 
+    a LaTeX package for producing charts of course nodes
+    linked by arrows representing pre- and co-requisites,
+
+  prerex 
+    an interactive program for creating and editing chart
+    descriptions, and
+
+  vprerex ("visual prerex", formerly called "previewer") 
+    a GUI and previewer for prerex.
+
+The implementation of prerex.sty is built on pgf, so that it may
+be used equally happily with latex or pdflatex; prerex is written in C
+and vprerex is written in C++ using the Qt-4 toolkit and the poppler
+library.
+
+See chart.{pdf,html} for a small example of a prerequisite chart and
+real-life examples at
+
+http://www.cs.queensu.ca/students/undergraduate/prerequisites/
+
+Prerequisite charts are useful to students selecting courses and
+planning their programs, and to faculty and staff advising students
+and managing curriculum development. Conventional sources of course,
+program and timetable information are rarely in a user-friendly format.
+Faculty and staff advisors, being already fairly familiar with their
+courses and programs, often do not appreciate how inconvenient it is
+for students to access all the information they need to make course
+choices. 
+
+The crucial tool in the prerex suite is "prerex.sty", a macro package
+that defines a "chart" environment and commands to specify construction
+of course boxes and directed arrows between them.
+
+prerex.sty depends on
+
+  pgf (and add-on tikz), version 1.18 or higher 
+  multido
+  relsize
+  calc
+  ifthen
+  zref-savepos
+  hyperref
+
+The use of pgf means that Postscript processing is not required;
+either pdflatex or latex -> dvips [ -> ps2pdf ] may be used.
+
+Installation of prerex.sty:
+
+  + copy prerex.sty to your-texmf-tree/tex/latex/misc
+  + copy doc/prerex.{tex,pdf} to your-texmf-tree/doc/latex/misc
+  + if necessary, refresh the TeX database (e.g., texhash)
+  + copy doc/prerex.sty.7 to sub-directory man7 of a man directory on your 
+    MANPATH
+  + test by doing 
+
+       man 7 prerex.sty
+       pdflatex chart.tex
+
+See doc/prerex.pdf for detailed documentation.
+
+The prerex editor allows interactive editing of the chart environments
+of LaTeX source files. It supports add, remove, cut-and-paste, and edit
+operations on course boxes and arrows, and vertical or horizontal shifts
+of the whole diagram or selected sets of course boxes. When a course
+box is moved, the arrows into and out of it automatically follow. 
+To install:
+
+  tar zxvf prerex-6.0.tar.gz
+  cd prerex-6.0
+  ./configure --help
+  ./configure [options]
+  make
+  sudo make install
+
+The effects of editing operations may be observed in any PDF viewer.
+The vprerex (visual prerex) application included in the prerex suite
+is a GUI and viewer for the prerex editor. It may be used just as a
+minimalistic viewer of arbitrary PDF files but supports editing of
+charts generated using prerex.sty by allowing coordinates of course
+boxes, arrows, and background points to be conveyed back to the prerex
+editor command-line using the clipboard.
+
+See the INSTALL in the tarball for installation instructions.
+
+An alternative is to use a version of kpdf/okular (PDF viewers in KDE)
+that has been patched to provide the same access to chart coordinates.
+The "patches" sub-directory provides patches for several recent
+versions of kpdf (KDE-3) and okular (KDE-4). See patches/README for
+instructions.
+
+See the file doc/intro.pdf for an overview of the prerex system.
+
+prerex.sty, README.prerex, prerex.1, prerex.5, prerex.sty.7, prerex.tex
+and chart.tex may be modified and distributed according to the terms of
+the LaTeX Project Public License.
+
+The source files for prerex, vprerex, and the kpdf/okular patches may
+be modified and distributed according to the terms of the GNU General
+Public Licence (version 2).