This is a simple trick to chat with your friends using Command Prompt
Steps:-
Open notepad (win key +R ,type notepad)
And input following text
@echo off
:A
Cls
echo MESSENGER
set /p n=User:
set /p m=Message:
net send %n% %m%
Pause
Goto A
And save it as messenger.bat
Open it and you will see
MESSENGER
User:
After user enter the ip of your friend
And you will see
MESSENGER
User: IP_Address
Message: (your message)
After Message type your message
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