OpenPlugin
Open plugin is a recent addition to rockbox
at the lowest level it allows storing and hashed lookup of plugins and parameters
its been integrated with the core to enable opening plugins on startup, hotkeys, shortcuts
There is also a companion plugin in the viewers folder to allow you to run plugins using openwith
and a shortcut to the plugin in the apps folder that uses it to start the viewer in editor mode
in edit mode you can export shortcuts back to the file system and use them from the file browser as if you were in the plugin folder
Another use is doing things like making a shortcut that starts the text viewer and loads a specified file using the parameter field