This tool was developed specifically for testing products running across a wide variety of hardware and software platforms. Since it is completely written in Java, any machine capable of supporting a Java Virtual Machine (JVM) can be used. The QAT tool can be divided into two main sections, the Agent, responsible for actually running each test or group of tests, and the Harness, which is responsible for test selection, management, result and agent co-ordination. All that is required to run a test on a given machine, is an Agent running in a compatible JVM.