backend_config_file     Get backend config file path
backend_default_dir     Get default backend directory
backend_default_exe     Get default backend executable path
backend_release_url     Backend release URL
backend_root            Get backend root directory
convert_html_to_pdf     Convert local 'HTML' or 'XHTML' file to 'PDF'
find_html2pdf_backend   Find configured backend executable
install_html2pdf_backend
                        Install external backend from GitHub Releases
launch_html2pdf_app     Launch graphical converter application
set_html2pdf_backend    Set backend executable path
