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     The _settextwindow function specifies a window in row and column
     coordinates, where all the text output to the screen is displayed.
     The arguments (<r1>, <c1>) specify the upper left corner of the
     text window. The arguments (<r2>, <c2>) specify the lower right
     corner of the text window.
 
     Text is output from the top of the text window down. When the text
     window is full, the uppermost line scrolls up out of it.
 
     Note that this function does not affect the output of
     presentation-graphics text (e.g., labels, axis marks). It
     also does not affect the output of the font-display routine
     _outgtext. Use the _setviewport function to control the display
     area for presentation graphics or fonts.
 
     Return Value
 
     None.
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