system {
  [ identity ( on | "string" ); ]
  [ version ( on | "string" ); ]
  [ nsid ( on | "string" | hex_string ); ]
  [ rundir "string"; ]
  [ pidfile "string"; ]
  [ workers integer; ]
  [ user string[.string]; ]
  [ max-conn-idle ( integer | integer(s | m | h | d); ) ]
  [ max-conn-handshake ( integer | integer(s | m | h | d); ) ]
  [ max-conn-reply ( integer | integer(s | m | h | d); ) ]
  [ transfers integer; ]
  [ rate-limit integer; ]
  [ rate-limit-size integer; ]
  [ rate-limit-slip integer; ]
  [ max-udp-payload integer; ]
}