Help in the relationship between Xlib windowID and GTK widget

["sarge Hwu" <sarge_ca hotmail com>]

Hi experts,

I met a problem:

There are two application A and B written by GTK,
I've know the window ID of B window by function XQueryTree in A,
but how can I get the corresponding GtkWidget* pointer of B window so that I 
can send GTK messages from A to B?

Is it possible? If so, give me a hand!

Thanks a lot!!!

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