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The code implementation for decentralized client logic is covered here: How to write decentralized events
To maintain backwards compatibility with the centralized client logic and to avoid redundant import checks, the decentralized client logic handling is activated only when an event namespace is assigned to the object master.
The event namespace needs to be assigned at object master level and, afterwards, it can be referenced within the master itself. (master-level, instance-level, menu-level).