hpux man page for xtwindow

XtWindow()																XtWindow()

Name
  XtWindow - return the window of the specified widget.

Synopsis
  Window XtWindow(w)
	 Widget w;

Inputs
  w	    Specifies the widget.  Must be of class Core or any subclass thereof.

Returns
  The window of w.

Description
  XtWindow()  returns  the window of the specified widget.  Note that the window is obtained from the Core window field, which may be NULL if
  the widget has not yet been realized.

Usage
  XtWindow() is implemented as a function when called from application code, but is replaced by a more efficient macro when called from  wid-
  get code that includes the file <X11/IntrinsicP.h>.

  Use XtWindowOfObject() to return the window of a widget or the nearest widget ancestor of a non-widget object.

See Also
  XtDisplay(1), XtScreen(1), XtWindowOfObject(1), XtWindowToWidget(1).

Xt - Object Information 														XtWindow()