Undo is a standard feature in most single-user interactive applications. The user can use undo to recover from erroneous operations, to learn system features by trial and error, and to explore alternative solutions by backtracking. The availability of undo in multi-user collaborative applications is particularly valuable because: (1) features available in single-user applications must also be available in corresponding multi-user applications to encourage users to learn, use, and adopt new collaborative applications; (2) the potential cost of an individual user's mistake is multiplied many times since it may adversely affect the work of a large number of collaborative users;…
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