in</I>
is a top-level window (its X parent is the root window of the
screen) and zero if <I>tkwin</I> is not a top-level window.
<P>
<B>Tk_ReqWidth</B> and <B>Tk_ReqHeight</B> return information about
the window's requested size.  These values correspond to the last
call to <B><A HREF="GeomReq.html">Tk_GeometryRequest</A></B> for <I>tkwin</I>.
<P>
<B>Tk_MinReqWidth</B> and <B>Tk_MinReqHeight</B> return information about
the window's minimum requested size.  These values correspond to the last
call to <B><A 