This document discusses the role of clearing corporations/houses in facilitating the settlement of trades done on stock exchanges for dematerialized shares. It lists the major stock exchanges in India and their linkages to NSDL. It then outlines the requirements for a clearing corporation/house to be admitted as a user on the depository, including ensuring payment against delivery, having the operational capability to provide clearing and settlement services, and cooperating to resolve client grievances. Finally, it provides details on the services provided by NSCCL, such as clearing and settlement, inter-region clearing, risk management, and securities lending/borrowing.