These actions can be security configuration changes, key and certificate management, access control policy changes, bus and other system resources management, and so on.

这些操作可以是安全配置更改、密钥和证书管理、访问控制策略更改、总线和其他系统资源管理等等。

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The system must provide security and control access to those functions based on permissions.

系统必须提供安全性，并根据相应的权限控制对这些功能的访问。

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By using access control matrix, we can achieve the real time and dynamic control of task, which ensures the system security.

通过引入访问控制矩阵，实现了对任务的实时、动态的控制，从而确保了系统的安全。

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Sendmail's new NT 3.0 product provides NT administrators with security features, like header scanning, relay access control, and better defenses against theoretical attacks, to which Unix and Linux system administrators are already accustomed.

CNN: Sendmail brings open source technology from Unix to NT