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Queues, Notifiers, DVRs and similar stuff, even when seems to be exposed from labview.exe in some form, is totally undocumented. Of course, you could try to RE those functions and if you're lucky enough, you could use few, maybe. But it will take a significant effort of you and won't become worth it at all. To synchronize your library with LabVIEW, you'd better try OS-native API (like Events, Mutexes, Semaphores or WaitableTimers on Windows) or some documented things like PostLVUserEvent or Occur of Occurrence API. To be honest, there are more Occurrence functions revealed, but they're undocumented as well, so use them at your own risk. What about CINs, I do recall that former Queues/Notifiers implementations were made on CINs entirely. I never had a chance to study their code, and not that I really wanted to. I suppose, they're not functional in modern LV versions anymore as they got replaced with better internal analogues.