AsyncToken (mx.rpc.AsyncToken)
An AsyncToken is an object used to correlate an asynchronous request with its response.
The AsyncToken class is found in the mx.rpc package.
Calls to asynchrounous functions...
Flex makes remote calls asynchronously, meaning dealing with the results of those calls is handled via events.
When an application makes several remote (asynchronous) calls, the responses will return in an unpredictable order.
AsyncToken and Responder work together.
var token:AsyncToken = httpService.send();
An AsyncToken is a dynamic object, so you can add whatever properties you want to it.
Responder
An AsyncToken object is often used with a Responder object.