Lynkeos recognizes several kind of plugins :

File access plugins, reader and/or writer.
Processing plugins ; list, image or other kind of processing.

All plugins can contain preference panes which will display in the Lynkeos preferences window.
The plugins are loaded at application startup

File access plugin

A file reader plugin shall contain one class (or more) implementing the LynkeosImageFileReader or LynkeosMovieFileReader protocol. A file writer plugin shall contain one class (or more) implementing the LynkeosImageFileWriter or LynkeosMovieFileWriter protocol.
See the file access documentation for more information.

Processing plugin

A processing plugin shall contain a class implementing the LynkeosProcessingView protocol, to provide the graphical interface ; it probably should contain a class implementing the LynkeosProcessing protocol, to perform the processing.
See the processing architecture documentation for more information.

Preferences in a plugin

Any plugin can contain a class implementing the LynkeosPreferences protocol to provide a preferences pane.
See the protocols documentation for more information.

help

Any plugin can provide some help, to be displayed in Lynkeos application.
The plugin help files shall be put in a help folder inside the localized resources. The help files shall be compliant with the AppleHelp guidelines. And finaly, the plugin bundle shall provide the AppleHelp keys :

CFBundleHelpBookFolder gives the name of that folder, as explained in AppleHelp guidelines.
CFBundleHelpBookName gives the name of the main html file of the help. This deviates from the AppleHelp guidelines, and is specific to the Lynkeos plugins help.