If you have a client/server system, the server should never trust the client.
如果您有一个客户机/服务器系统，服务器应该永远不要相信客户机。
Clock synchronization services work by changing the system clock on the client systems to match the clock on the server system.
时钟同步服务通过把客户机系统上的系统时钟改成与服务器系统相匹配的时钟而起作用。
Security considerations when connecting to a database from a client system to a server system.
客户机系统通过服务器系统连接到数据库时的安全性考虑。
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