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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 _GetTextWindow procedure finds the boundaries of the current
    text window. The text window is the region of the screen to which
    output from the _OutText and _OutMem procedures are limited. By
    default, this is the entire screen unless it has been redefined by
    the _SetTextWindow procedure.
 
    Note:  Screen definitions by _SetTextWindow have no effect on
    output from the _OutGText procedure. Displaying text with _OutGText
    is limited to the current viewport.