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Using the synchronous model to run parallel executions

TS 2017, LV 2018

I wish to run up to 4 UUTs at a time, independently, from a LV UI and display any given VI in the sequence in a sub panel.  Using some example code (multi window UI Example and sub panel example) I can run 4 copies of my sequence, with my own process model, make the Vis re-entrant and the code is much simpler than the parallel process model.  My question is:  what's the best way to keep track of which sequence is telling the UI message model callback to put it's VI front panel in one of the sub panels?  I assume there are 4 copies of the test sequence running, but are there 4 copies of the process model running too?  Do I need to create a variable in the process model and return that to the UI every time a displayable front panel executes?  

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