Hi, mayurdeolasee. I'm not sure what you mean. First, I assume we're talking about replay debugging (the subject of this forum). Now, are you interested in how to use replay debugging? If so, the replay debugging blog (http://www.replaydebugging.com/2008/08/getting-started-with-replay-debugging.html) is a good place to start. Or are you asking how it's implemented? If so, there's very little publicly available at this point. Perhaps we should write some papers! E.