注意：操作系统识别有时候会出错。
Caveat: operating system fingerprints are occasionally wrong.
然后，介绍了现阶段安全扫描软件所采用的安全扫描技术，介绍了远程操作系统识别技术、端口扫描技术，并分析研究了基于插件的漏洞扫描技术。
Then, we introduced the technology of network security detection in common secure scanner including the remote OS detection, port scanning and vulnerability scanning based on using plug-in.
对于所负责的资源和操作系统无法识别的用户帐户，程序有时必须强制实施它们自己的访问控制要求。
Programs must sometimes enforce their own access control requirements on resources they are responsible for and on user accounts not recognized by the operating system.
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