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  Arguments
 
    r1    Top row of current text window
 
    c1    Leftmost column of current text window
 
    r2    Bottom row of current text window
 
    c2    Rightmost column of current text window
 
  Description
 
    The _SetTextWindow procedure specifies a window in which all text
    output is displayed. Output from the _OutText and _OutMem
    procedures appears only in this window.
 
    Text is displayed from the current text position, which is relative
    to the top left of the window. When text reaches the right edge of
    the window, it either wraps or is truncated, depending on the wrap
    state set by the _WrapOn function. When the text window is full,
    the window scrolls up one line.
 
    _SetTextWindow can be used in all video modes. After a new window
    is set by _SetTextWindow, all text output goes to this new window.
 
    Note:  This function does not affect the output of the font text
    routine _OutGText. Use the _SetViewport function to control the
    display area for output fonts.
 
  _GrStatus Returns
 
    _GrParameterAltered