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     The settextwindow subroutine 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.
 
     The upper left corner of the text window is considered to be row 1,
     column 1.
 
     Text is output from the top of the text window down. When the text
     window is full, the uppermost line scrolls off the top of the
     window.
 
     Note that this subroutine 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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