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Check if User Event destroyed?

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Is there some way of checking if a User Event has been destroyed, or is even active before registering? 

For instance, if an event structure has registered to a User Event - then the User Event gets destroyed run time, is there some way to recover/get an error in the event structure that the User Event it's waiting for no longer exists? 

 

Cheers

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Solution
Accepted by topic author rthomas101

Use the built-in function on the Comparison palette "Not A Number/Path/Refnum?"

"If you weren't supposed to push it, it wouldn't be a button."
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Perfect! Thank you, it's been driving me nuts for days. 

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