控制系统处理编码于CD中的子码部分。
The control system processes the subcode that is encoded on the CD.
管理码（母码）可以删除或者增加用户码（子码）；
Master password can be used to add or delete any sub password.
这个函数返回一个整数，代表子进程的退出码。
The function returns an integer, which represents the exit code for the child process.
这个函数返回一个整数，代表子进程的退出码。
The function returns an integer, which represents the exit code for the child process.
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