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Display *XtDisplay(w) Widget w;Widget XtParent(w) Widget w;
Screen *XtScreen(w) Widget w;
Window XtWindow(w) Widget w;
XtParent returns the parent widget for the specified widget.
XtScreen returns the screen pointer for the specified widget.
XtWindow returns the window of the specified widget.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface