If there are other users of your testmachine, they must be aware of your test plans — otherwise they may think they are experiencing some severe problem such as a denial-of-service attack.
For the modules that are only needed for service calls, you may not need to install those applications on the same machine as the WebSphere test environment.
The enterprise is always treating the quality of the machine as life, treat the service as the soul, and take the contents of the customers as the only standard to test the company.