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  telnet    ：
  Control Panel，  Program  Turn Windows features on or off，         telnet client       。
         telnet server    ，    ~~~~~     。
win7  telnet          。
    cmd   telnet  telnet  ， telnet            ，
Microsoft Telnet> ?/help
Commands may be abbreviated. Supported commands are:

c     - close                     close current connection

d     - display                  display operating parameters

o     - open hostname [port]      connect to hostname (default port 23).

q     - quit                      exit telnet

set   - set                      set options (type 'set ?' for a list)

sen   - send                  send strings to server

st    - status                  print status information

u     - unset                   unset options (type 'unset ?' for a list)

?/h   - help                    print help information