Once the pre-processing and XHTML processes are completed, most of the HTML Help processing is handled by the following targets:

dita.map.htmlhelp

Create the HHP, HHC, and HHK files. The HHK file is sorted based on the language of the map.

dita.htmlhelp.convertlang

Ensures that the content can be processed correctly by the compiler, and that the appropriate code pages and languages are used.

compile.HTML.Help

Attempts to detect the HTML Help compiler. If the compiler is found, the full project is compiled into a single CHM file.