GooSeeker

By default only one replica is enabled on the Extraction Editor work board. If a list is to be extracted from a target page, two replicas must be enabled and mapped for MetaStudio to calculate duplication rules. In order to enable the 2nd replica, right-button pop-up menu Enable 2nd in Replica Management groupbox should be clicked. So the radio button marked with number 2 is enabled. Replicas can be switched by pushing the two radio buttons. After it has been enabled, the second replica should be mapped with data snippets on the sample page which is stated MetaStudio User's Guide#Map property.

The right-button pop-up menu over the Replica Management groupbox has a "ping-pong" feature. After the second replica has been enabled, the menu is changed to Disable 2nd which is used to disable the second replica.