The following links contain information on the internals of packages in the Open Source Collection:
Outline of the installation directories.
Description of the package names.
Description of how startup scripts are created for various daemons like HTTPD, NTP, Postfix, etc.
Rationale behind the /opt/TWWfsw/gcc343r runtime directory.
/opt/TWWfsw/gcc343r
Customizing the module search path for Perl and Python.