opensolaris man page for intro

Intro(4)							   File Formats 							  Intro(4)

NAME
       Intro, intro - introduction to file formats

DESCRIPTION
       This  section outlines the formats of various files. The C structure declarations for the file formats are given where applicable. Usually,
       the headers containing these structure declarations can be found in the directories /usr/include or /usr/include/sys. For  inclusion  in  C
       language programs, however, the syntax #include <filename.h> or #include <sys/filename.h> should be used.

SunOS 5.11							    16 Apr 2003 							  Intro(4)