its
data structures up-to-date.
<P>
<B>Tk_IsContainer</B> returns a non-zero value if <I>tkwin</I>
is a container, and that some other application may be embedding
itself inside <I>tkwin</I>.
<P>
<B>Tk_IsEmbedded</B> returns a non-zero value if <I>tkwin</I>
is not a free-standing window, but rather is embedded in some
other application.
<P>
<B>Tk_IsMapped</B> returns a non-zero value if <I>tkwin</I>
is mapped and zero if <I>tkwin</I> is not mapped.
<P>
<B>Tk_IsTopLevel</B> returns a non-zero value if <I>tkw