QuickTime 4 Reference
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Opens a custom action-handling component that may be referred to later by its handlerID.
Typically, you will first use the kOperandUniqueCustomActionHandlerID operand to obtain a unique id. After storing this in a variable, you will use this action to open the handler. Then you may use kOperandCustomActionHandlerOpen to determine if the handler was found.
How a custom action handler is specified to handle a given action in a movie is explained above in the section on "Authoring Custom Wired Actions".
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