Because it can very easily become cluttered, install icons in the Deskbar's shelf only when it provides information that is updated often or if it provides functionality which will be frequently accessed by the user. Examples of these kinds of situations would be monitoring memory and processor load, checking mail, or quick access to features provided by a personal information management program. If it is unlikely that the user will need to access the information or functionality less than once per session, don't use the Deskbar -- accessing your program through the Be menu or an icon on the desktop should be sufficient.