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That works, thanks a lot!

I tried to use the AE to trigger user events in two VIs, but not successful. Only one of them can trigger the other depending on which starts first. What's the best way to to make a two-way communication (trigger)? I used to use queue, but since the real application each already has a queue (producer/consumer), and the consumer may have things running blocking the queue listening, which means I'll have to make more queues, that just sort of messy. Test.zip

Ton, It's sooooo awesome! I just tried, it works. You saved my day sir! Thanks!

Can it do so with the python still running?

I have a labview code to control instruments (camera, lights, etc), and am learning to use Panda3D (programming in python) to build a simple 3D game/animation. Usually at the end of the script there's run() function to start the rendering the 3D scene. I can execute the .py with the "system exec.vi", but how to bridge a communication between the two? Basically what I want is to synchronize certain events inside the two programs, just like what LV does with queue/notifier. Thanks,