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Usage: Occasionally, an object's method takes a long time to complete. If the job is canceled before the call returns, the script engine still must wait until the call returns. This could potentially take hours and limit resources. This method solves the problem by registering a method that is asynchronously called by the script engine if the script gets canceled.
A good practice is to hide implementation details of a COM object from the caller, having the COM object itself handle all registration and deregistration of cancel commands. Pass an instance of the Script object to the COM object, then call the RegisterCancelCommand() and DeregisterCancelCommand() methods because the Script object implements the IDispatch interface.
Arguments: See Table 27 for RegisterCancelCommand method arguments.
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