Retrieving an owner's existing workflow instance id?

I just configure my environment to run a "hello world"
workflow.  After going through the documentation and a
lot of the code, I could not find a means of
retrieving an owner's open workflow instances.  I'm
ultimately trying to build a "task list" based on
"available actions" but this requires knowing the
workflowinstance id.  If the workflow is accomplished
over multiple days/sessions how does one recover the
workflow id in order to get available actions, current
steps, execute actions, etc?

Thanks
Jon

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