A skeleton Horde application consists of the following:

README                  Application README text file
index.php               Application index script
config/
    conf.xml            XML schema for the application configuration file
    conf.php            Main application configuration file
    mime_drivers.php    Any application-specific MIME Viewers
    prefs.php           Application preferences
docs/
    CHANGES             Development changelog
    INSTALL             Installation documentation
themes/
    screen.css          CSS definitions
    graphics/
        application.png Application icon
lib/
    Application.php     Main application code library
    api.php             Methods to be exposed to other applications
    base.php            Common script dependencies
    version.php         Application version information
template/
    common-header.inc   Common page header template