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 qattr                                                                 QWIKC
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 Function       Changes just the attribute in a rows-by-columns block on the
                screen.
 Syntax         void qattr( unsigned char row, unsigned char col,
                            unsigned char rows, unsigned char cols,
                            int attr );
 Remarks        The upper left corner of the block starts at (row,col) and
                the block size is rows by cols.  Note that you can even
                change 1 row and/or 1 column.  If SAMEATTR is used for attr
                or if rows or cols is zero, then nothing is written.
 Return value   None.
 Screens        All video pages and virtual screens.
 EOS            Updated.
 Restrictions   Stay within the screen limits.
 Example        To create inverse video on any screen:

                  qattr( 1, 1, crt_rows, crt_cols, BLACK+LIGHTGRAY_BG );