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  get an application to also use libXt?
 
 Tk2.1 and Xt have different X connections, and XtAppNextEvent will
block is there is nothing coming from the X connection.  One way
of fixing this is get the connection number of Tk using

   ConnectionNumber(Tk_Display(tk_window));

and using XtAddInput to register this with the Xt event handler.  The
callback procedure for XtAddInput wrapper procedure that runs
Tk_OneEvent(1).  There might be problems with Tk file sources which
aren`t registered with Xt.

Thanks to joe@astro.as.utexas.edu (Joe Wang) for this information.