Asynchronous tasks run in the background and call functions when the task generates an event. Asynchronous tasks are created by functions such as URLFetchAsynchronous and URLSaveAsynchronous.
StopAsynchronousTask — stop asynchronous evaluations from an asynchronous task
StartAsynchronousTask — resume asynchronous evaluations from an asynchronous task
WaitAsynchronousTask — wait for an asynchronous task to complete
RemoveAsynchronousTask — shut down an asynchronous task