CoWord

CoWord

A CoWord editing session with 2 users
Developer(s)	Advanced ậCollaborative Technology Research
Stable release	1.0 / May 15, 2007
Operating system	Windows
Type	Word Processor
License	Free
Website	cooffice.ntu.edu.sg/coword

CoWord is a software add-on to Microsoft Word to enable multiple users to edit the same document over the Internet with MS Word. It is a part of the CoOffice suite of collaboration tools for Microsoft Office.

CoWord can be considered as a collaborative real-time editor, with the editor being MS Word (which is not distributed with CoWord). To use CoWord, users need to supply their own copies of MS Word.

As of August 2010, CoWord has become CodoxWord, released by CodoxWare.

Technology

One of the main challenges in building collaborative real-time editors is in concurrency control. The concurrency control technology used by CoWord is Operational transformation. Operational transformation (OT) can incorporate concurrent changes made to replicas of the same document. This means systems built with OT allow multiple users to make concurrent changes to the document and all changes will be incorporated. Other known systems based on Operational transformation are: ACE, Gobby, and Subethaedit.

In CoWord, OT is implemented in a module called Generic Collaborative Engine (GCE). GCE is also provided as a library package, allowing other developers to create real-time collaborative editing systems without having to implement OT.

External links

• CodoxWord Home page
• Adaption technology used build CoWord
• The operational transformation algorithm used by CoWord
• OTFAQ: Operational Transformation Frequently Asked Questions and Answers
• Presentation of CoWord technology to Microsoft Research (Video)
• CodoxWord and CodoxWare

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