Using LabVIEW you are advised to use error codes from 5000 to 9999 and from -8999 to -8000 for user defined errors (none of the LabVIEW libraries use these ranges).
In CVI several libraries use different error code ranges, but there isn't any range explicitly reserved for user defined errors.
I think that this could be an useful feature.
Vix
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In claris non fit interpretatio
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Using LV from 7
Using LW/CVI from 6.0
