re width of virtual root.
<P><DT>int <B>heightPtr</B> (out)<DD>
Points to word in which to store height of virtual root.
<P></DL>
<H3><A NAME="M5">DESCRIPTION</A></H3>
<B>Tk_GetVRootGeometry</B> returns geometry information about the virtual
root window associated with <I>tkwin</I>.  The
&#8220;associated&#8221;
virtual root is the one in which <I>tkwin</I>'s nearest top-level ancestor (or
<I>tkwin</I> itself if it is a top-level window) has
been reparented by the window manager.  This window is identified 