Where do I get info on OI

#1
Hi All,

I keep hearing abt increase in Open Interest in perticular stocks or there are shorts in the system.

My question is where I can get these stock specific F & O data, information.

E.g. HDIL stock up by 4% , OI is up by 23 lk shares.

My second question is what is the relationship between cash market and derivative market.

Thanks in advance.
 

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