Mutually exclusive with the async argument. If true, this will execute the interception point but multi-thread each of the CFCs that are listening to the interception point. So if 3 CFCs are listening, then 3 separate threads will be created for each CFC call. By default, the calling thread will wait for all 3 separate threads to finalize in order to continue with the execution. Extra arguments that can be used: asyncAllJoin, asyncTimeout, asyncPriority.