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     The scrolltextwindow subroutine 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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