The "Messages" window is your source for all of RealFlow’s notifications. There you will find error messages, notifications about saved or opened projects, time steps, or debug information from Python scripts or C++ programs. With custom scripts and plug-ins it is possible to print out customized messages or values directly to the "Messages" window for debugging. But please be aware that writing out long text passages or large amounts of data (e.g. per simulation step) to the "Messages" window can significantly slow down RealFlow.