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To apply a customised window you have to follow some global methods and rules. Once you have understood the basic concepts, the creation process for GUIs and windows is always the same , and should become routine with growing experience. One of these rules concerns data types. In “normal” scripts, RealFlow was always able to automatically detect the data type and there was no need to introduce them separately, like
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A GUI can be opened either from a batch script or a simulation events script. In the latter case the GUI can only be started at the beginning of a simulation, not during a running process.