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These demos illustrate the 'options' parameter (formerly 'DoSWFCallback') to DoSWF.

Demo 'c' shows the 'swfEICheck' property, which specifies the name (string value) of an ExternalInterface callback function to check for on the loaded SWF. The swfCB callback is notified when this function is detected and ready, and in this demo, it shows the function responding to this event by calling the EI function on the SWF knowing for sure that it's initialized and ready to be called.