The actual user ID-timestamp is carried in a session object, which is referenced by all aggregate objects that are changed during one session. CA Gen creates a unique session object for the set of changes from one toolset session each time a model update occurs. Functions on the encyclopedia that affect model information, such as Packaging, Rename, or Delete, also incorporate this logic. The reference for an aggregate object changes each time a component of that aggregate object changes, so that it always points to the last change made.
Session objects have an ID number, which is assigned in sequence as sessions are added. Since these numbers are assigned chronologically, the greatest value indicates the latest change to the model.
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