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In the Process pane, click the  action that you want. For example, click Print Document. 
                 
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On the action property tab, click in a field that supports variables. The Insert Variable 
control in the toolbar becomes available. For example, click in the Document field.  
                 
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Click 
, and then click More Variables to open the Insert Variable dialog.
                 
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In the left navigation pane of the Insert Variable dialog, click Process to display a list of all predefined process variables. 
                 
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Click the variable that you want, and then click OK to close the dialog and insert the variable in the property input field. Alternatively, double-click the variable.