preopen

I am a novice in the stock market and am reading the wealth of info here to learn before I begin paper trading and then real trading. I have been looking at a lot of Charts both intraday and daily and see a lot of high spikes during the Preopen period. Was wondering how this affects the charts...

From 18th Octiber, normal trading hours has been moved from 9am to 9:15am. First 15 minutes, i.e, 9am to 9:15am will be used for open price discovery. This will be called Pre-open session. The NSE weblink contains the details about the open price session...