[flexcoders] object vs AsyncToken ?

[markflex2007]

Hi,

In the delegate of Cairngorm,what the different between the following
two statements in same function call .(one use object and one use
asynctoken).

Thanks

MK

1

 var call : Object = service.GetAll();
 call.addResponder( responder );

2

 var token:AsyncToken = service.ArrayGetAll();
 token.addResponder( responder);