There are certain issues that must be addressed to allow a web service client to run on a client machine properly or to interact with multiple identical services hosts on separate Windchill instances. Security policy configuration is essentially hard-coded at compile time, requiring a new client to be reconfigured for each client host. Similarly, the address of the web service is fixed at compile time, and therefore writing a client that interacts with separate service instances requires the service endpoint to be provided programatically. To improve the portability of web service clients, the Web Services Framework uses the JAX-WS handler chain, and allows client JAR files to be reconfigured as needed.