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  Routine:      CBL_READ_SCR_CHATTRS
 
  Function:     Reads a string of characters and their attributes
                from the screen.
 
  Syntax:       CALL "CBL_READ_SCR_CHATTRS" USING     screen-position
                                                      character-buffer
                                                      attribute-buffer
                                                      string-length
                                            RETURNING status-code
 
  Parameters:   screen-position        Group item defined as:
                  row-number             PIC X COMP-X.
                  column-number          PIC X COMP-X.
                character-buffer       PIC X(n).
                attribute-buffer       PIC X(n).
                string-length          PIC X(2) COMP-X.
                status-code            See ◄Key►
                                    -♦-