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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _scrolltextwindow function scrolls 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.
 
     The constants _GSCROLLUP and _GSCROLLDOWN (defined in GRAPH.H)
     scroll up one line or down one line, respectively.
 
     Return Value
 
     None.
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