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in the Contents window, an element in the knowledge tree with all its descendants (incl. its children). All elements in a branch can be processed with subset operations. For example, if you would like to review your physics material before an exam, you could select the Physics branch in the Contents window, and click Learn (Ctrl+L) at the bottom of the window. You can add new branches with Add and Insert (Ins) in the Contents window. A branch that is built automatically by adding elements to a concept is called a concept group. All concepts are associated with their own branches/groups. By analogy to Windows, when a branch has no content and is use solely to hold other branches or elements, it may be called a folder.
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