This screenshot shows the Aggregator Editor window. This window is divided into two panels. The panel on the left lists the following links, from top to bottom: Name, Groups, Input Attributes, and Output Attributes. The Output Attributes link is currently selected.
The panel on the right contains a table where you can define the Output attributes for the Aggregator operator. The table contains the following columns: Attribute, Expression, Data type, and Length. Below the table, on the right hand-side, are the Back, Next, OK, and Cancel buttons. At the lower left-hand corner of the page is the Help button.