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Hello. I am new to processing and want to start with a simple program. This program should display images in seperate windows with seperate window sizes. I also need a notification, if a window is closed/opened. I want to use the G4P library, but if I use the background image I always get the message, that the image size must be the same size as the application. How could I check if a window is closed/opened? I want to display a warning image if a value has reached, but it only have to display again, if the window is closed. I think its easy, but I dont know how. I hope someone could help me. Thanks for helping.