Note: Each service in the service application has a main function for that service. When a request is made to start the service, the main thread of the service calls the RegisterServiceCtrlHandler function to register this control handler function. TService automatically calls RegisterServiceCtrlHandler and returns this handler function. Because this function cannot be a class method (member function), the Service application wizard generates code that creates a non-member handler, (ServiceController) for your service object. This routine returns the service object's Handler (Controller).