http://jakarta.apache.org/jetspeed/site/forwards.html

This link could help us understand the structure of jetspeed urls, in particular, various prebuilt actions.

In short the actions are

controls.Maximize - go to maximize mode for the specified portlet. 
controls.Minimize - go to minimize mode for the specified portlet. 
controls.Customize - go to customize mode for the specified portlet 
controls.Info - go to information mode for the specified portlet. 
controls.Print - go to print mode for the specified portlet. 
controls.Close - go to close mode for the specified portlet. 
controls.Restore - go to restore the specified portlet.