From this screen you can manage your RPG definition sets.
To select a definition set, click twice on it, this window will close and the new def set will be active.
Add new database definition set: This option will enable you to add an existing def set to the current list. It won't create a new def set, this must be done manually(see RPG definition sets for details). To add an existing def set, just select the def set directory and it will automatically be added.
Delete selected definition set: This option will delete the def set from the list. It will NOT delete the def set files on the hard disk. The def set will only be remove from the list and can be re-use again later.