
Here is the overview of the documents in the doc/ directory.

old/CIDR.txt		- Description of CIDR in IPv4
Tao-of-IRC.940110       - No comment...
blocklist.txt           - Setting up DNSBL/RBL blocklists, verifying
                          with /TESTRBL, HOPM dnsbl conversion
challenge.txt           - Overview of the challenge/response system for
                          obtaining operator status
example.conf            - An example ircd.conf file describing most of the
                          user settable options
genssl.sh		- creates a self signed certificate and DH parameters file
genopercert.sh          - Creates a self signed certificate for opers.
ircd_crontab.sh         - Crontab script for ircd-ratbox.
ratbox-rotate.sh        - Crontab script to rotate ratbox log files.
hooks.txt		- Overview of the hooks available
index.txt		- This file
ircd.motd               - A default ircd.motd used by make install
logfiles.txt		- Description of formatting of some logfiles
modeg.txt               - An in depth description of the server side silence
                          user mode (+g)
modes.txt               - A list of all user and channel modes
operguide.txt           - EFnet operator's guide
server-version-info     - Overview of the flags shown in /version
whats-new-*.txt		- What new features are available

Also in the contrib/ directory you will find:
example_module.c - An example module, detailing what the code in a module
		   does.  Useful for building your own modules.
