Information about configuring a STEP worker can be found here:
http://www.ptc.com/appserver/cs/view/solution.jsp?n=CS111954
Information about configuring a distributed file server worker can be found in the Windchill Visualization Services Guide located here:
http://www.ptc.com/WCMS/files/157363/en/WindchillVisualizationServicesGuide_10-2-M010.pdf (Chapter 9)