Image shows the Invoke activity window. There are five tabs at the top: General, Correlations, Sensors, Adapters, and Annotations. The Name field displays below. Below that is the Partner Role Web Service Interface section, with two fields: Partner Link and Operation. Partner Link has an icon on the far right. Below this are the Input Variable and Output Variable fields. Both of these fields have two icons at the far right. At the bottom are the Help, Apply, OK, and Cancel buttons.