The Emergency Simulation Program (ESP)
Open Category Screen Shot
ESP Categories can contain either Media Clips or 'sub' Categories. 'Opening' a Category displays a new window showing the contents of the opened Category. Thus a Category 'Planes Landing' could contain the sub-categories 'Planes landing on water', 'Planes landing on land', etc. Here, the Category 'Burning Structures' contains the sub-Categories 'Buildings fully involved' and 'Farm Structures', as well as a single Media Clip 'Aftermath'.
A Category can contain any number of 'levels' of sub-categories, though it's most practical to limit the depth to no more than 2 or three levels.
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