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XtTranslateCoords - translate widget
coordinates 
void XtTranslateCoords(w, x, y, rootx_return, rooty_return)
      Widget w;
 
      Position x, y;
 
      Position *rootx_return, *rooty_return;
 
- rootx_return
 
- rooty_return
- Returns the root-relative x and y coordinates. 
- x
 
- y
- Specify the widget-relative x and y coordinates. 
- w
- Specifies the widget.
While XtTranslateCoords   is similar to the Xlib XTranslateCoordinates
  function, it does not generate a server request because all the required
information already is in the widget's data structures.
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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