Returns a string representing the path to the known local user configuration file.
传回字串，表示已知本机使用者组态档的路径。
Returns a string representing the path to the known roaming user configuration file.
传回字串，表示已知漫游使用者组态档的路径。
Then we discuss the whole gateway software from three processes: PLC communication process, network communication process and user configuration file download process.
并将整个网关程序分三个进程讨论，以分别负责PLC通信、网络接口通信与用户配置文件下载。
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