Yes Mr Rkkarnani is Absolutelly right
1) this data is of NSE.
2) time bar is 1 min
3) it has more than 1100 nse Cash script
and web address in the file where every saturday they update the historical data and increasing so you can check it with 30 min. bar too
further you can use this data in Amibroker also
please tell me if anything else i can do for you
enjoy
Amit