[PD] How to open two gem win under one PD program? for multi-purposes?

[Henry Lin]

Hello
   I need to open two gem win (window) for two different function.  one is 
to display video the other is for detecting exposure of a light.   It 
doesn't matter what i use do in those gem win.  But iam stuck on opening up 
TWO GEM WIN  in ONE PD PROGRAM?

can anyone give me some advise?

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