TCS要求控制关键系统资源的分配和释放，包括数据库记录、通信套接字、安全密钥，等等。

The TCS requires control over the allocation and release of key system resources, including database records, communication sockets, security keys, etc.

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这第一个检查将确保记录每次击键的按下和释放操作。

This first check ensures that a press and release is recorded for every key stroke you intended.

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这项功能经常被忽略，并且密码文本框只记录按键事件而忽略释放事件。

Most often this feature is ignored, and password text boxes simply record key-press events and ignore key-release events.

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