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     The _scrolltextwindow function scrolls the text in a text window
     (previously defined by the _settextwindow function).
 
     The <lines> argument specifies the number of lines to scroll. A
     positive value scrolls the window up (the usual direction); a
     negative value scrolls the window down. Specifying a number larger
     than the height of the current text window is equivalent to
     calling _clearscreen(_GWINDOW). A value of 0 for <lines> has no
     effect on the text.
 
     Return Value
 
     None.
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