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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def launchDashboardOverlay(self, pchAppKey):
 """ Launches the dashboard overlay application if it is not already running. This call is only valid for dashboard overlay applications. """


        fn = self.function_table.launchDashboardOverlay
        result = fn(pchAppKey)
        return result