This document describes the GRAPH unit for Free Pascal, for all
platforms. The unit was first written for DOS by Florian klämpfl, but was later completely
rewritten by Carl-Eric Codere to be completely portable.
This chapter is divided in 4 sections.
The first section gives an introduction to the graph unit.
The second section lists the pre-defined constants, types and variables.
The second section describes the functions which appear in the interface part of the
GRAPH unit.
The last part describes some system-specific issues.