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  1. element subset: set of elements saved in a file, or
  2. registry subset: set of registry members saved in a file.
You can create an element subset by using the element browser (e.g. Subset : Save all or Select : Save selection on the browser menu). You can view an element subset with View : Subset from the main menu.
Registry subsets are mostly used in search and sort operations. For example, you could use Ctrl+S to find all texts containing the word virus. Those will be displayed as a registry subset in the text registry window. You could use Ctrl+S again to search for the word AIDS and generate a narrower subset that would contain both words virus and AIDS