Documentation for MPLAB® Harmony is included in the download package. You can find it in the "doc" folder. PDF, CHM and HTML versions of this file are available.
The CHM format is most convenient when using the documentation on a Windows® PC, the PDF is useful for printing sections of the documentation, and HTML format is suitable for Web browser or other programmatic access to the documentation.
The MPLAB® Harmony installation comes with extensive help documentation that includes release information, training materials, and complete demonstration and library reference documentation (Click on the “Library Interface” topic to see a convenient API summary table.).