I am an expert at using your product and can write your user guide with my eyes closed.
我是使用贵公司产品方面的专家，闭着眼睛我都能替你写出用户指南来。
2
The server can keep all of its ports closed until the user has provided a secret knock sequence (a sequence is easy to implement and requires modest resources).
服务器可以关闭所有端口，直到用户提供一个秘密的敲门序列(序列很容易实现，而且需要的资源不多)。
3
Highlight the current panel so the user can distinguish open panel headers from closed panel headers.