-Q2.C.5- use Tk in a subwindow of a non-Tk X11 application?

From: -II-  Tk Questions and Answers - How can I:

A2.C.5. From faustus@CS.Berkeley.EDU (Wayne A. Christopher):

[C]reate the Tk toplevel window but don't map it (wm withdraw).  Then
re-parent the window to be a subwindow of your other one and then map
it.  I have done this when the Tk application is a separate process,
but if it's the same process I think you will get into trouble with the
event loop, since each toolkit wants control.

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