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  Parameters on Entry:
 
     screen-position         The screen position to start reading at.
                             The top left corner is row 0, column 0.
                             See ◄Notes on screen routines►.
 
     string-length           The length of the string to read.
 
  Parameters on Exit:
 
     character-buffer        The characters read from the screen. This
                             data item must be at least as long as
                             specified by string-length; positions
                             in it beyond that length are unchanged.
 
     string-length           If the end of the screen is reached, the
                             length read is returned in here.
                                    -♦-