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The SID is a unique number that marks a given session. For example, if you go to Road Atlanta and participate in 3 races, than each race will have a different SID (e.g., 33, 34, and 35). When looking through the lap display you will see SID 33, lap 1, 2, 3, etc.; then SID 34, lap 1 2 3 etc. etc. Basically, it allows you to tell which laps were in a particular race.
