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ExecuteTrigger ISI might be designed to return some value, therefore introducing a class of `Library Triggers` that are used by other Triggers for various features.
Triggers can also communicate by defining and emitting event at their execution.
Execution Limits
Trigger execution uses validators' processing resources and therefore has to be limited for the network to stay operational.
Limits would mainly apply to User Level triggers as they are registered freely and are not part of the system itself.
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