This class can be used to manage a StateWorkflow.

Amongst the more useful functions is the SetState function that can be used to force the workflow into a specific state using the qualified name of the StateActivity. This is a wrapper round the SetStateQueue WorkflowQueue and the SetStateEventArgs class.

Another interesting property is the StateHistory.

The PossibleStateTransitions properties gives you a list of designed state switches.

http://msdn2.microsoft.com/en-us/library/system.workflow.activities.statemachineworkflowinstance.aspx