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I would think Flex loads them asynchronously. That's why we use events to detect when the load is complete.
asynchronously? I think so also, but being that Flex is a Single-Threaded Application it is my understanding that each URLLoader.load() is tagged in the chain of Threads that need to execute serially. So even if it is asynchronous the real question is once a URLLoader has begun can it become intrrupted by the execution of another URLLoader.load() event. And I think this answer is "no" again, bc of Flex is a Single-Threaded Application Environment.
However thanks Greg, I think I'll wait for a developer to answer this question unless you discover something first!
The Flash Player is "single threaded" from the viewpoint of executing Actionscript code. It is not, itself, single threaded.
The results will be asynchronous, you cannot rely on the order of their return.