Integrated security = Windows NT Security. From books on line: The login is created in Microsoft Windows NT® 4.0 or Windows® 2000 rather than in SQL Server. This login is then granted permission to connect to an instance of SQL Server. The login is granted access within SQL Server.

SQL Server achieves login security integration with Windows NT 4.0 or Windows 2000 by using the security attributes of a network user to control login access. A user's network security attributes are established at network login time and are validated by a Windows domain controller. When a network user tries to connect, SQL Server uses Windows-based facilities to determine the validated network user name. SQL Server then verifies that the person is who they say they are, and then permits or denies login access based on that network user name alone, without requiring a separate login name and password.