HTML Help
You can access the HTML Help online from http://www.helpndoc.com/sites/default/files/documentation/html/index.html
PDF Documentation
Download HelpNDoc's PDF documentation (1.6MB) from http://www.helpndoc.com/sites/default/files/documentation/HelpNDoc User Manual.pdf
HND Documentation source
Download HelpNDoc's documentation source (1.8MB) from http://www.helpndoc.com/sites/default/files/documentation/HelpNDoc User Manual.hnd