XCreateWindow - parent argument implications

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When I create a main window of my X11 application I specify a root window as a XCreateWindow parent argument. My application allow to open a dialog boxes, for example "Open File" window. When I create such window I pass a main window as a XCreateWindow parent argument. It looks logical but what are implications of that choice ? I could also pass a root window as a dialog box parent window. Is it somehow related to a override-redirect flag or calling XSetTransientForHint?

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