Config service supports the concept of sessions; that is, all queries and modifications made through config service are not saved into the config directory until a save command is issued.

配置服务支持会话这个概念；也就是说，直到保存命令被发出，所有通过配置服务进行的查询和修改才会被存入config目录。

youdao

When you've found a file with what you hope is the right line, save the file as a:config.sys.

CNN: Top 50 Windows tips