Participant wise open Interest:

This page shows the data for each participant with trend wherein each participant has a different colored line. Based on the intensity of net long and net short positions respectively, traders evaluate whether the participants are bullish or bearish on the market direction.

All traders are classified into four categories

1) Client
2) DII
3) FII
4) Pro

Client - Retail trades and HNI (High Networth Individuals) are covered under this category
DII - Domestic Institutional Investors (Banks, Insurance companies, Mutual fund houses)
FII - Foreign Institutional Investors (an investor or investment fund registered in a country outside of the one in which it is investing. Ex: Hedge Funds, Insurance companies, Pension funds, sovereign wealth fund (SWF) etc)
Pro - Proprietary trading (also "prop trading") occurs when a trader trades stocks, bonds, currencies, commodities, their derivatives, or other financial instruments with the firm's own money, aka the nostro account, contrary to depositors' money, in order to make a profit for itself (Source: Wikipedia)

Participant Wise OI