[kepler-dev] workflow execution id?

[ben leinfelder]

Hi devs,
I'm wondering if anyone knows if there is a way to uniquely identify a  
workflow execution.  My goal is to place various R actor output  
(graphic files, text files, etc...) generated during a workflow  
execution into a folder for that run of the workflow.  I've played  
around with the Workspace "version" and also the Director "start time"  
but neither of those seem to meet my needs.
Any suggestions are appreciated.
thanks,
-ben

(I'm trying to tread lightly (or not at all) on the provenance work  
being done)