This functionality is Sneak Peek status. This means that the APIs may change. We welcome your feedback, ideas, and code, but please use caution if you use this new functionality.
Returns the unique identifier of the given listener. If the listener has none, one will be added and returned.
|integer||The unique identifier allocated to this listener.|
The guid of a listener can be used...
In this example, the identifier of the listener is used to register a record of information about the listener. Later, the guid of a listener is used to check whether or not a record exists for the listener before action is taken using it.