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This is how I clear errors.

Automatic error handling is for noobs.

Sure I'll add it, I thought everyone had a VI like that. We use it to indicate that the developer is aware that an error could be generated at this point in the code. It helps when we do code review.

BTW, the ability to connect a NULL reference is intended. This way, you can switch off certain events by modifying the Event Registration Refnum entries with NULL values. I have code where I register for certain events outside of a loop with exclusively NULL references, only to have a different event actually deliver the correct event references to listen to. This way the Event registration refnum is created at initialisation but remains essentially inactive until "primed".