The present invention provides a generic technique to perform access control check for data access and/or for doing an operation in a COM based system comprised of multiple servers and having multiple users. A unique user security context number is generated after validating the user for a session, based on user entered authentication parameters. The generation of the security context numbers and the fetching of the access control information from storage medium is managed by a central security server. The generated unique user security context number is then used throughout the session to check for access permission for data access and/or to perform an operation requested by the user during the session.