A container can only call ActionScript code that's in a function--no other ActionScript code can be called by a container
First, you must register your ActionScript function to indicate that it should be made available to the container.
- Use the ExternalInterface.addCallback() method to do this
- The addCallback() method takes two parameters:
  - Parameter 1: the name by which the function will be known to the container
  - Parameter 2: the actual ActionScript function that will be executed when the container calls the defined function name
- E.g.
- function callMe(name:String):String {
- return "busy signal";
- }
- ExternalInterface.addCallback("myFunction", callMe);

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