HelpBlocks is used to build wxWidgets HTML help files. The sources are in the help directory and have the extension htd. One can edit the sources with the HelpBlocks application or with any text editor. One needs the HelpBlocks program to build zipped wxWidgets help files that are stored cain.htb.
There is no automatic way to convert the archive of HTML files into a PDF document. Thus I have written an index of the files in index.html. If you add a new section to the documentation you will need to update this file. I use Adobe Acrobat Pro to convert this HTML file to the PDF version of the documentation. When creating the PDF document click the "Capture Multiple Levels" button and select "Entire site".