2. Say if closing price was 100 and the stock opened at 96 then the fair chance exists that during the day stock may touch near 100 as it will try to fill the gap created during the day.
3. Thus a day trader can benefit by following the opning and closing prices during the day.However religiously follow the practice in those stocks in which one has faith in fundamentals and such stocks price movement should not be based on rumour mongering.