attach 4009命令启动对当前正在运行的nweb服务器的调试工作，并且gdb调试工具通过读取有关该进程的所有的符号信息来做出同样方式的响应。
The attach 4009 command starts debugging the currently running nweb server, and the GDB Debugger responds in kind by reading all the symbolic information about the process it can.
如果使用服务器中的符号，则可以使用本地目录提高调试器的性能。
You can use a local directory to increase debugger performance when you use symbols from a server.
符号：在生成期间发布到符号服务器的调试符号。
Symbols: The debugging symbols published to a symbol server during the build.
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