These paths are the ones mrViewer will use to find CTL scripts. The value is taken from the environment variable CTL_MODULE_PATH.
This section shows you all CTL scripts to be found in the CTL_MODULE_PATH. By following the convention, starting with IDT for Input Display Transforms, ODT prefixed scripts would be Output Display Transform scripts, RRT prefixed scripts would be used for Reference Rendering Transform scripts, LMT prefixes for Look Modification Transform scripts. Auxiliary scripts should not be prefixed.