In some scenarios you don't want the editor to be able to use a fully fledged CMS_INPUT_DOM component. There are switches to disable bold or italic for example. A less know option is to disable links, which can be done by providing an empty LINKEDITOR param:
<LANGINFO lang="*" label="Text"/>
Here's an example of a stripped down CMS_INPUT_DOM component, which doesn't allow any kind of formatting. You might want to use this if the editor should enter an (unformatted) teaser.