As Mike pointed rightly, activity: @baseclass.RedirectAndRun is used to redirect the URL/location in a specified thread.There is an OOTB activity:LaunchRedirectAndRun under RS:PegaSCM. This activity sets the request type and the new thread name paramerets and calls Redirect and Run to create a new thread. Here is the screenshot of this activity. Not sure whether this RS is present in your application stack or not. There is a function:getNewThreadName() used to get the new Thread from the same activity. If you have these rules in your system, may be you can play around and get the solution for your issue. Or, you can just see the referencing rules for RedirectAndRun activity from your version and build the logic.
Java code used for the above function:Check this code and give a try