[rules-users] Flow action - insert into KnowledgeSession

I have defined a WorkItemHandler which can, based on the parameters, collect some additional data. I would like to insert the new facts into the session but I do not see where a workItemHandler can get access to the current stateless session. Should this be done by returning the new facts in the results ? If so, how can you insert the results into the session? Thanks Kent Symanzik