A framework for undoing actions in collaborative systems

@article{Prakash1994AFF,
  title={A framework for undoing actions in collaborative systems},
  author={Atul Prakash and Michael J. Knister},
  journal={ACM Trans. Comput. Hum. Interact.},
  year={1994},
  volume={1},
  pages={295-330}
}
The ability to undo operations is a standard feature in most single-user interactive applications. We propose a general framework for implementing undo in collaborative systems. The framework allows users to reverse their own changes individually, taking into account the possibility of conflicts between different users' operations that may prevent an undo. The proposed framework has been incorporated into DistEdit, a toolkit for building group text editors. Based on our experience with DistEdit… 
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