The z/OS® FTP client displays each command it sends to the FTP server, and the FTP server reply to that command. As mandated in RFC 959, an FTP server must reply to every command an FTP client sends to it. The replies are architected to begin with a three digit reply code, followed by human readable text. The reply code indicates the status of the command; the text provides additional information. FTP clients generally interpret only the reply code and ignore the text. The reply code indicates to the client whether the server is still processing the command, or whether the server finished processing the command successfully, or whether the server stopped processing the command because of errors. For a generic description of FTP server reply codes, see RFC 959 and RFC 1123. Information about accessing RFCs can be found in Related protocol specifications. For a complete list of the replies used by the z/OS FTP server, see z/OS Communications Server: IP and SNA Codes.