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I made a nice little interface for the Pi to switch GPIOs by clicking a button. I use CreateDialog for it. In Linux I can, after having created the window, click on the top bar and then chose undecorate. That is then exactly what I want. Is there a way for CreateDialog to issue a window undecorated (without the top bar)? Or is there an alternative to CreateDialog?

CreateDialog[
 Row[{"Hello world ghjdghjdghjdghjdghjdghj\t", DefaultButton[]}], 
 WindowTitle -> "no need for it"]
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@Kuba: That was the needed input to find the solution. By browsing through the options of WindowFrame (not mentioned for CreateDialog) I found the answer to my question:

CreateDialog[
 Row[{"Hello world ghjdghjdghjdghjdghjdghj\t", DefaultButton[]}], 
 StyleDefinitions -> "Dialog.nb", WindowFrame -> "Frameless", 
 WindowSize -> All]
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