This document summarizes the key features and functions of the National Stock Exchange (NSE) trading system in India, including order matching processes, different market types (normal, odd lot, RETDEBT, auction), user screens and functions, and order management controls like branch and user order value limits. The maximum new user order value limit that can be set for a new user at the Chennai branch of Agre Financial Services is 150 lakh rupees based on the existing branch and user limits provided.