SEBI came into force in 1992. Securities and exchange Board of India (SEBI) was first established in the year 1988 as a non-statutory body for regulating the securities market. It became an autonomous body by The Government of India on 12 May 1992 and given statutory powers in 1992 with SEBI Act 1992 being passed by the Indian Parliament.
Margin trading is called to buying of shares by taking money from brokers. Buying on margin means to borrow money from a broker (similar to a loan) to purchase stock. The investor can take position in the market by paying an initial margin of 50 per cent (your own money), while the broker could finance the balance 50 per cent.