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 twPop()
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     Closes the top window of the stack and restores the information
     which was under it when it was opened or updated by twMove(),
     twSlide() or twSize(), unless you have manipulated the stack
     yourself. Frames and titles are also updated if the frame colour
     is of type array.

       Arguments:

     None.

       Return:

     Current window handle.

       Example:

     twPop()