Actionscript:
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trace((new Date()).getTime() + Math.random()*0xFFFFFF);
A hacky way to get a unique ID, although this isn't, perfect it works well enough. For a project that you really expect to get huge amounts of traffic... you might consider using php's uniqid() function and passing it into your swf. That said, the odds of two users getting the same two ID values are about as good as the odds of you winning the lottery twice in a row.
Here is a version wrapped in a function, with a prefix argument:
Actionscript:
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trace(uniqid("z"));
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function uniqid(prefix:String):String{
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return prefix + (new Date()).getTime() + Math.random()*0xFFFFFF;
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}