$AsynchronousTask returns the current AsynchronousTaskObject.
When Mathematica evaluates the event function, $AsynchronousTask is set to the AsynchronousTaskObject that generated the event.
When not running an event function or error function, $AsynchronousTask is not set.
AsynchronousTasks StopAsynchronousTask StartAsynchronousTask URLFetchAsynchronous URLSaveAsynchronous WaitAsynchronousTask
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