When you exit the initial application, it returns control to the environment where you started it. If the Debugger is running when you exit, the Debugger closes its window but leaves Debugger session settings, such as window size and location, initialized in the OpenEdge environment. If you then run the same or another application using the Editor or AppBuilder Debugger option, the Debugger window opens with its previous window settings and takes control with a breakpoint at the first executable line.