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     The _gettextwindow function 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 functions is limited. By
     default, this is the entire screen unless it has been redefined by
     the _settextwindow function.
 
     Screen definitions by _settextwindow have no effect on output from
     the _outgtext function. Displaying text with _outgtext is limited
     to the current viewport.
 
     Return Value
 
     None.
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