# -Q2.C.1- get an application to also use libXt?

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

    A2.C.1. 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.

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