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Get Initiating User Action, returns the user that originally started the Workflow execution.
For using this action, select from the list:

wf1.gif

This action, doesn't have any input parameter, and only one output param with the User Lookup and you can use it like the following example:

wf2.gif

Last edited Sep 9, 2016 at 9:41 PM by demian_rasko, version 3