While Loop Action Usage
A While action usage performs a body clause Action usage iteratively as long as its while expression continues to evaluate to true and its until expression continues to evaluate to false.
Creating a While Loop Action Usage
To create a While Loop Action usage
1. On the System Structure Diagram ribbon toolbar, in the Action section, click the 
While button.
While button.2. On the diagram, click within an Action definition, Action usage or a Perform Action usage.