2. Understanding the Replicator : Replicator Processing Tables : Shadow Table
 
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Shadow Table
The shadow table maintains a history of previous transactions. It contains a row for each row in the base table that has been manipulated. Shadow table rows include the system-generated replicated transaction key for that manipulation, plus the previous replicated transaction key, along with the base table’s designated unique key.
Note:  Shadow tables are used only in full peer or protected read-only targets.