monitor and update an object collaboratively

HP Wei <>
Thu Mar 20 20:49:07 CET 2003

  Is there an example of codes for doing the following ?
  An object (a file contents, a drawing board etc)
  is monitored by many users on different nodes.
  Each user can modify the object.
  At that time of modification by one user,
  all others can only 'see' but not be able to modify the object.

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