I am trying to find specific assigned activities in a workflow process so that I can programmatically close them (with a vote if possible) and keep them in the tasks completed tables, rather than have them disappear.  I can go from activity to process, but cannot see anything to go in reverse from process to activity... and I can see the WorkflowHelper/Service that can list WorkItems but do not know the relation of these to the assigned activities.  Is there a basic cheat sheet in the help guider anywhere that I can read and begin to try things without always begging for help from the community?