Intraday Realtime FREE NSE BSE Backfill Data google yahoo

Google Realtime Intraday Backfill Data

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How to get the realtime intraday backfill data. Many of us know that google provides 15 day intraday 1min backfill. But where is the source
how the softwares like Manshi RT and volume digger getting those backfill data?
The below link gives the realtime backfill data which most of the softwares are probably using it as a source for realtime datafeed
http://www.google.com/finance/getprices?q=RELIANCE&x=NSE&i=60&p=5d&f=d,c,o,h,l&df=cpct&auto=1&ts=1266701290218
where
q= stock symbol on Google finance
x= exchange symbol
i= interval (here 60 means 60 sec (1 minute interval))
p= no of period(here 5d denotes 5 days of data)
f= parameters (day, close, open, high and low)
df= difference (cpct is may be in % change )
auto =1,
ts = time start… if you cut the last 4 digits…the rest gives the start day in seconds
you can choose your own set of value depending upon your need.
The following link gives the 1 min Realtime data for Nifty
http://www.google.com/finance/getprices?q=.NSEI&x=NSE&i=60&p=15d&f=d,o,h,l,c,v
Using the above explanation we can build any formats(1min,5min, 15min,hourly) of real time data and can be use as a backfill
to feed charting softwares like Amibroker, Metastock, Ninja Trader etc
To get 1 min Data
http://www.google.com/finance/getprices?q=CIPLA&x=NSE&i=60&p=15d&f=d,o,h,l,c,v
To get 5 min Data
http://www.google.com/finance/getprices?q=CIPLA&x=NSE&i=300&p=15d&f=d,o,h,l,c,v
to get 15 min Data
http://www.google.com/finance/getprices?q=CIPLA&x=NSE&i=900&p=15d&f=d,o,h,l,c,v
to get Hourly Data
http://www.google.com/finance/getprices?q=CIPLA&x=NSE&i=3600&p=15d&f=d,o,h,l,c,v
want to know how to and from where to fetch intraday realtimedata feed using yahoo finance. Here is the link where the yahoo finance offers real time data updates in realtime in csv format at free of cost.