Call function module SAP_WAPI_CREATE_EVENT (with COMMIT_WORK = space) to create an event, and use the event to start your workflow (triggering event). Alternatively, you can start the workflow directly using the corresponding SAP_WAPI function module for that purpose. My recommendation is that you normally don't start workflows directly as it is a less flexible solution (or you have to build that flexibility yourself instead of using what you get for free with triggering events).
However, why are you asking this question? I started wondering after seeing you ask an almost identical question in [another thread|; here.
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