The TestOut Client Pro certification exam measures the ability to perform tasks commonly performed by IT professionals who work with the Windows operating system. Training in the Windows operating system is valuable in nearly any IT career. Windows OS professionals include application support and desktop support analysts, help desk specialists and support specialists. Passing the TestOut Client Pro certification indicates proficiency in a number of core job tasks. These tasks include installation and monitoring of the Windows operating system, managing access for users and groups, managing hardware and applications, and working with networks, printing, and security.