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This educational continuum includes : backpacks of educational materials that contain a variety of information , lesson plans , teaching aids , and activities that teachers or high school students can use in their classrooms to teach about the Great Lakes ; web-based instruction that can be taken at home over the course of several weeks ; one-day workshops attached to professional conferences and meetings ; and multi-day site-based workshops and courses . Easily moved items like play sets and swings , RV 's , and picnic tables can be placed out of the reach of the hazardous tree with little effort and expense . We all can be in contact with teachers and help the teachers . Because a MUD is extensible via a programming language , the objects in the MUD can be programmed to do anything that you could do with any other type of program .