How to retrieve the interpreter from a Tk_Window?

Hi all,

I have register a ClientMessageHandler for a Tk_Window, with
Tk_CreateClientMessageHandler. My event gets handled,
and my callback function gets called. But how can I get the
Tcl_Interp that this Tk_Window has been created in?
(It seems that Tk keeps this information internally, in the
TkWindow structure. But how can I get this information from
an extension?)

George


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