GUI users – A GUI user is a single instance of a GUI script running on a computer. Only one GUI user at a time can run on a computer.
A GUI user emulates the "front-end" activities that real users perform as they interact with the application in their daily work. Such activities include keystrokes, mouse movements, and all other GUI-oriented actions.
You include GUI users in functional tests. You can also include GUI users in performance tests (such as load and stress tests) done using a TestManager suite.